Schwarzkopf is also a very good manufacturer..so i've heard.
I only did one (Turbine) and I was surprised how awesome it really was... I thought of it as a big rust pile and it was ([:P]) but the ride still kicked ass, the g's in the loop were just amazing.
Intamin also scores high with me...with Goliath standing out...OMFG that's one hell of a coaster...and I didn't even do all those major ones in the US, they only look better and better now.
As for B&M...I actually never rode one yet and they seeme very cool to me, but they're just missing something that I think Intamins do have. I don't know what it is.
And well Vekoma...I love the nostalgic ones and the newer rides...it's great how they're innovating since the last couple of years.
Ow and last but not least..GCI..
OMFG, Troy, do I have to say anything more?