I've decided I need to go ahead and replace my 31 year old TH350. It has numerous problems and I just really don't think it would be worth repairing them all. I want to stay with a TH350, and I'm going back to a stall converter that matches my cam a little better (Currently running a 2400, planning on a 3500). What I'm debating is what brand transimission to buy. The ones I have looked at:

B&M - about $900
Hughes - about $900
TCI - about $800

Do these built transmissions come with a shift kit already installed? Should I be looking at some other brands? My car sees a fair amount of abuse, so I want something that can handle it.