Well, I'll be paying over a year, so I guess I could stretch it a tiny bit more...Id change mobo and PSU personally, but it'll push your budget up, whats your max?
Looks good, not sure on the VGA cooler, according to this 4870 is newest one supported, granted the 4890 is very new, may be worth firing an email to them to clarify compatibility.
Also not had much experience of the coolermaster heatsinks, I'd go for a Noctua or TRUE or something along those lines, but tbh the coolermaster will most likely suffice.