i have asked all my bass playing friends this question and have gotten a different answer everytime. i have never used anything but 45-100 nickel rounds. i play in a band that calls for me to have to fill a lot of space (electro drums, and minimal guitars with lots of synths) i also have some songs that call for the disco octave thing, and quick walking up fill type stuff. no slap. while i have no complaints really about my 45-100 nickel rounds ive always used, i think they sound a bit too thin for live and my hand usually cramps up pretty quickly perhaps because they are too floppy and i end up pounding them to get them to "thicken up" (i play all fingers by the way). although recorded they work great. also, sustain, fundamental, and articulation are paramount. so, oh wise genii of TB. what string do you recommend? flats? steels? chromes? i play an MIA jazz.