The dual channel issue is ..maybe some mistake while editing the page. While i was talking to the salesperson, he clearly said 1*2GB and 1*1GB this this cud never run in dual channel unless it has a 975XPB mobo which it certainly not.
[it cud run un identical modules in dual channel].
And Dell used to give GDDR2 wala 8600GT and they recently shifted to GDDR3 8600GT.
Im damn sure the one i got GDDR3 as many apps like GPUZ is showing like dat.
I dun think u can change config after sending money, but surelly can even just before transfering the amount. Coz they ll start the shipment as soon as they get da cash.
memory upgrade seems better than headset, as even a 300 bucks wired headsets sounds much better than that. Also choosing wireless N card is more future proof. U can connect to N network working at 5Ghz nd u ll get speeds comparable to cable network, though ull need a wireless N router which is becoming cheap day by day.