Anyway, everything looks ok, I just don't like the thought of using the PSU that comes with that case (Thermaltake PSU's aren't very good, and I'm thinking the one that comes with that case is lower quality than even a normal TT PSU). It has enough wattage (supposedly), but I still wouldn't really trust it.
also what is the matter with the thermal take power supply
Just lower quality than some brands. The lower end TT's tend to not last very long, and I would say that the one that comes with that case is almost definitely a low end model.
It would help to know exactly WHICH model it is, but I have doubts that it's any good. The 7770 isn't exactly a power hungry card though, so it's not like you'll really be pushing it to its limits. The problem is that it may only provide something like 350-400W on the 12V rail and not 500W (I would almost guarantee it).