Thanks for the input all. I think i will go with the Asus X1900XT. I'll be getting Crossfire further down the line anyway, which has the standard cooler, so whats a little extra noise.
Also, thanks to everyone who has helped me put this together. It's my first computer im planning on building.
Like I will tell someone thinking of going SLI, unless you can add that 2nd card within 90 days or plan on outright replacing the 1900XT with 2 new cards later, don't fall for the hype. If you cannot purchase both cards within 90 days, Xfire (like SLI) is a total waste of your money. If you wait 6-8 months, the best card in 6-8 months will beat your Xfire setup and you spend more money. Don't fall into the XFire/SLI upgrade trap, its a completely dead upgrade path.
I am going to buy the same Antec case, plus the non-led version of your HSF, i am looking to make it as quiet as possible by using the acoustipack deluxe soundproofing kit, rubber fan mounts and various other tricks.
The quality of the case is incredible, some nice innovations. thankfully it also matches the Logitech S510 keyboard im going to get.
im not upgrading yet though, just putting together a detailed plan for it.
you can debate cpu's and graphics cards til your face bursts. but the case and HSF is an easy choice.