What an experience it is to be on the quest to find ones tone.
I recently purchased a Markbass F1 Amp & a Traveler 102P to go along with it a few weeks ago, from our very own TB'ers here.
On paper, it was everything I (thought I) wanted in a setup. Alas, it is not for me. So it has taught me a valuable lesson about buying without trying.
This experience however, has helped me take huge strides in terms of understanding what my sound will be.
Somewhat harrowed, I have been looking at reviews, videos, and amp/cabinet manufacturers to determine what else I might be interested in.
I want a warm aggressive tone, that can also have crystal clear cleans and highs. I love a good low mid punch, with a nice growly low end.
I visited a "somewhat" local Guitar place today to try to find that tone. Armed with my trusty Spector Euro 4LX, I tried out 4 different setups, and I have taken great leaps and bounds in the right direction to what drives me.
First Setup
Amp: Gallien Krueger 1001RB-II
Cabinet: Gallien Krueger 410RBH
First impressions. Wow! This thing is loud! I had my Jazz pup at 50%, my Precision Pup at 25% and the EQ's all at noon, I would turn up the master volume to 1 and this amp would bellow, so much in fact, that I have to put it down to about .75.

The GK has a very transparent/open sound to it, I feel like you could "almost" dial in any tone you wanted. It sings up high, and has a deep enough low end, but is lacking a sort of character, that I am after.
Second Setup
Amp: Eden WT800C
Cabinet: Eden D410XLT
As soon as I turned this on, with all the EQ's at noon, I could already tell how warm it was. By far, the warmest amp I have ever encountered. The Eden glowed like a Christmas tree with all of its lights and buttons, it looked like the mothership. So many options, and so many that I would never use.
I boosted the lows a bit, and added a bit more low mid for the punch I am after, put my Jazz pickup on full, with my Precision at 20% and this thing growled with every pluck. I was loving it. I ran through some of my favorite Atheist lines, and could tell it was 90% of what I wanted. I was having so much fun, I spent 30 minutes on it, just plucking away happily.
Third Setup
Amp: Ampeg SVT-4 Pro
Cabinet: Ampeg SVT-410HLF
The very very nice friendly guitar associate was very welcoming and did not complain when I asked to be moved over the my 3rd setup. The Ampeg.
I have had it in my head, that an Ampeg is exactly what I want, because of the growl that my favorite bass players get out of it. Rex Brown, Juan Alderete, and Chris Kringel to name a few.
The associate sets me up on the most expensive demo I have ever had the privilege of trying. EQ's flat, I hit a D note, and instantly can feel the classic warm, tubey, growly, Ampeg sound wash over me, I sigh really deep and close my eyes. It was everything I thought it would be and more, I run through those Atheist bass lines again, and sigh really big once more. It was perfect. I ring out some harmonics, and they soar into the heavens singing gracefully, they register amazingly well. Everything I played sounded so good. I didn't want to stop, but there was one more setup to try.
Fourth Setup
Amp: Gallien Krueger 1001RB-II
Cabinet: SWR Golight 410
I thought it would be more of the same with the RBH, but it wasn't. The SWR had a great growly character that I could really dig into, but there was only one thing that irked me.
It seemed as if the SWR neo's were just lacking that deep bottom end, and was a bit hollow and thin, as I similarly encountered with my Markbass. As light as it is, I just don't know if I could part with the full deep bass tone that I was able to get from the 98 lb 410 Eden.
Conculsions:
I LOVE/WANT/NEED/WILL SELL MY CHILDREN FOR, that Ampeg setup. It has MY sound written all over it.Unfortunately, it is so expensive, and so heavy, that unless I get famous and have roadies, I will not haul this rig around.
I am going back to the store later this week to further demo the Eden, and it very well might be my amp and cabinet of choice.
I will be selling/trading my Markbass setup if anyone shows any interest here.
Hope it all made sense, and flowed, there are so many thoughts to get down.
Thanks, and good luck on YOUR quest for YOUR tone.