Hey CK. If you're going to get a Tubescreamer, make sure it's a TS-808, or at least a modded one (think some people call it the Brown mod or some ****?). The generic ones are puss. As the name suggests, the Tubescreamer will make a good tube amp go over the top and sound great, but will do very little for solid state amps. Expensive but worth it, esp if you're partial to a bit of soloing.
A lot of the Boss stuff you have mentioned is a part of the ME-50 multiple effects (analog version of GT-8). I've got one and I ****ing love it. Very simple to use and saves me carting around 200 pedals. Some of the distortions and mods are crap. but plenty of usable ones, with good recreations of the Tubescreamer, Rat, Hot Fuzz and of course, all the good Boss tones we all love. Built like a tank, with a great sounding wah, (I think so anyway, many disagree) it is a good option for minimal outlay, but in saying that, you can't beat a pedal chain with quality gear, just doesn't happen.
I have both the Boss tuner and the Behringer tuner,as well as the one in the ME-50. The Behringer one, imo, is just as good and a third of the price.
T-Rex is absolute quality, can't go wrong, and for a bit of patriotic noise, MI Audio make some great stuff too.
Wasn't sure if you have these pedals or were thinking of buying them, so if you do, reply with' Shut the **** up ****' Rock on CK :headbange