Yes it is worthwile gtx 650ti is faster than hd 7770.waiting for 2 week is not big task!
i just dont like waiting its like 7770 today vs 650ti in 1-2 weeks (of boring school with no real video card)
but if the diff is big/huge i might wait
btw dont know what 7770 to get
the giga byte or sapphire or powercolor (WTHisthat) or msi or xfx or asus