FLM if you want a bullet proof bulk setup for sure - Check out Rcdirectonline
ACNCM no longer is in business but you can find there parts on ebay...In fact there is a guy who stumbled into a HUGE box of there BB upgrade kits and is selling them super cheap on ebay.
Golden Horizons stuff is good aswell, just can't get anything raw/polioshed which sucks.
Hot Racing makes some good stuff but I'm not sure if you can still find there items. I have there Bulk/tower combo sitting in my parts bin.
Great Assembly is up there with FLM/UE stuff in my opinion but it seems they are starting to fall off and don't stock as much T-Maxx stuff as they used too.
Integy...More like Crapegy - They make cheap stuff with premium price tags, I have owned a few Integy parts and they bend and break very easy. The only thing that Integy makes that is good are NON-Structural parts. Things like upgraded linkages, fuel tank posts, battery boxs etc.
RCRaven makes good products but the quality control is kind of bad. I have owned quite a few of there parts (have a few in my parts bin) and you may have to do a little grinding to get stuff to fit perfect.