Hey THANX heaps Vic- really appreciate this! DR strings were virtually UNHEARD of here- at least to ME anyway, until the net opened up a world of info to us. 
But I tried the coated strings a while back, & as I said - I liked 'em. I think MY fave coated string would probably be Elixirs followed CLOSELY by D'addario's EXP coateds.
BUT I toatally understand you when you say the caoting wears off & can 'clog' the string etc.. & i definately do NOT like them when they get 'old'. 
I DO wash my hands before each set 90% of the time, & have a container with a rag soaked in alcohol, which I wipe it all down with after the gig.
All this HELPS, but IF it's a gig where there are lotsa heat producing lights, a hot environment & of course being ONSTAGE -we're up a few feet closer to the ceiling 
then sweat & grime gets IN there, & save for gettng a wire brush out & cleaning the strings 'horizontally'
-the 'gunk' just DOES get in there.
BUT- as I said with the AC- I'm finding I'm definately getting longer life out of a set, simply coz the BASS sounds good & it doesn't matter to me that the string isn't as bright as it was. I'd rather a slightly 'worn-in' string as opposed to a brand new string sound anyway. I suppose this is ONE reason why coated strings agree with me.
I'll definately try a set of round core DR's soon. As what you describe about them reinforces what Kirk described to me earlier, & they 'sound' like they might be good for me.
Re Stainless Steel strings, I 'went off' them a few yrs ago, when I had a set that I wasn't impressed with. I was told then(by a local store assistant) the usual plus's of them, but I found them to almost be the opposite.
They didn't SEEM brighter sounding, didn't last any longer than the regular nickel one's I'd been using & maybe from being used to nickel- I didn't really like their feel. BUT- might give them a try again soon.
I think I'll try a set or two of the SUNBEAMS soon- these are the nickel round-core DR aren't they?
Thanks again for your thoughts & info- it'll help a lot & I really appreciate it.
Regards,
Rod
QUOTE from VIC- [Ok, a few thoughts here...
The round core strings are gonna' have two significant attributes outside of tonal diffs... longer life, and slinkier feel. So if you like extra fret sizzle, or if you play with a lighter touch and/or higher action, you'll get a lot more bang for your buck with round core.
The hex core strings are gonna' be the opposite of the above. Stiffer feel (just as bassarama says), so you can set them up lower with less buzz (hence their name in the DR line "LoRider"). But they don't last as long because as soon as the corners of the core's hexagon start to wear down, the strings' windings lose coherency and the tone loses "life". Basically, with hex, you're reducing the contact space between the core and the first winding, which means it wears faster.
The other thing is tone. Compared to a hex core set, IMHO, the round core strings have a little bit less going on in the upper mids/low treble (let's say 2-3K range), and the round cores have a bit more going on up higher. In short, I LOVE round cores for slap/sizzle, but I think they lack a little bite/edge aggression for fingerstyle BY COMPARISON. Lots of things can affect that, tho... bass tone, rig, playing style, and of course prefs (yeah, the usual disclaimer list).
So as usual, it's just "the right tool for the right job" with regard to feel/tone, and if your prefs are one way, you might get longer life too.
So what about coated strings? You're correct that, at least with DR's, their coated strings are based on the HiBeams, so it's round core. The HiBeams have that extra high end, and the coating muffles that a bit, so it kinda evens it out. They do increase life from a corrosion standpoint, but if you're talking skin deposits, you still just have to clean the strings between sets for that. Finally, I've found the coating tends to start to come off, and then it's almost ironic that the coating starts to "clog" the string, and has a counterproductive result, and it also gets on your fingers and fingerboard.
Personally, I just try to keep my hands very clean, wipe my strings down a lot, and use SS strings (even though I do generally prefer the slickery feel of Nickel, and do use Nickels on some basses). A trick I use is to wash right before each set with hot soapy water. Even if you sweat, it reduces the oil content, and it's easier to clean your strings.
Anyway, IME/IMHO, hope it helps.
] QUOTE