Should I wait?

What games do you want to play, and at what resolution? What brand and model (not just wattage) is your PSU, and finally, what is your budget for a new card?

Well Im thinking of getting a 660 now (originally a 550ti) to get some future proofing, and my psu is a pathetic no-name 400w bought by my family-.-
quite struggling with the $$ as I expect to have the money for the 660 in early February

If your PSU is a no-name, figure on it being good for no more than 300W or you risk smoking it (and possibly attached parts). In that case, the strongest card you should safely consider is a HD7770, and really a HD7750 would be an even safer choice.
The good news is that a $45 380W Antec Earthwatts can handle a GTX660 or even a HD7850.