EVGA doesn't even list the 9800 gtx on newegg anymore so it figures they would be the first to put the gtx+ out on there. If you don't want to move up to this there are some nice price drops on the regular gtx ...some go as low as $185 with free games n stuff
And the resale value will be less because of all the confusing names. Nubs will be like "wtf 9800gtx? same thing as + right?".
9800gtx+ = around $200
4850= $150. Sometimes as low as $140 after MIR with coupon codes.
Newegg has Sapphire HD 4850 512MB PCI-Express Video Card for $175 - $15 (with code S4F50242L) - $20 Rebate = $140 with free shipping.
I think the 4850 is STILL the better buy. Just saying...