and well hes not too far from where i live, and right now 4890s run between 180-220, 275 is at 250-280 and 5850 is 319-329 in price.
im still personally getting the 5850 even tho it did raise in price like 30 bucks because on the 18th i'll be able to upgrade, and i don't think i'll be able to otherwise...so im upgrading.
the 275 will still be a great card tho, overclock that like a mother and it'll outperform a 285 too.
im starting to look into aftermarket VGA coolers tho because i dunno if the 5850 stock cooler will be ideal for the overclock i wanna force on it, you might wanna do the same bout the 275 im not sure. but you can get great coolers for like 30-50 bucks. might be something you can spend christmas money on instead of another card, and just overclock the bajesus out of it