First on the compatibility:
At the end of the day they are all compatible, however depending on which BIOS version the Asus M4A88t-V ships with, it might not recognize the Phenom II x6 1100t.
So unless you have a supported CPU available to update the bios, it might not work off the bat.
Secondly on the component choices:
Depening on your usage of the PC you might not need the extra 2 cores, for gaming a Phenom II x4 955 BE would do just as good.
The motherboard does not have an AM3+ socket, so it will not support the new bulldozer CPU's from AMD. So might want to look for one that does.
I would steer clear of the low end cooler master PSU's. Get a similar wattage unit from Antec, Corsair, Seasonic or XFX.
You should also consider: GTX460 1GB, Radeon HD 6870 and even GTX560 as well when looking at the graphics card upgrade.
As a more generic comment, if you don't have to buy this thing right now, wait about a month so that the bulldozer CPU's come out and see how they perform. They should be better generally than the similarly priced Phenom II chips.