Skurj it doesn't really deserve the GF4 title because it lacks practically all the technological advancements embedded in the real Gf4 series.
It will be outdated months, maybe even a year before the real deal, forcing you to pay more than the difference for a more powerful card.
My principle is to upgrade to 80% of the top performance - that way I won't have to change parts every other month, keep cost reasonable and have top-notch performance in the meantime.
I haven't seen a hardware site yet that would actually reckommend buying one if you can spare a few extra bucks for the Ti.