US$57.090 according to this currency converter gadget on my desktop... which I don't really know how accurate it is.
Regardless, I dunno, it really depends on what games you have already.
If you don't have the Orange Box or Left 4 Dead, I'd probably recommend that, since over Steam they're pretty damn cheap - US$30 and US$40 respectively. Alternatively there's Bioshock, which is only US$20 on Steam.
Incidentally, I think I saw Bioshock going for around $80 - $100 locally, so you'll save a bunch if you get it online.