I've been down a similar path. I've owned a Noble and a Shaw and ended up with a SLO on my board.
The cool thing about preamps is that everyone isn't looking for the same tone. I prefer a round, fat, vintage tone. I'm not a slapper or a metal guy. I just like to sit in the pocket and thump along...so tube preamps always seem to deliver that warm fat tone with a little bit of grit in it. So far, nothing solid state has given me that tone, but I hear the Nordstrand Starlifter is very good. I really want to pick one up used if anyone ever sells one.