chips for the 1.8t are from $350-$800. that only gives you about 15hp. (and with the coilpack problem, chips have become a problem esp. the APR from what i've heard).

supposedly there's a company now in sarasota (i believe) that does rom tuning for VW's which would probably be a better investment.

another better investment is a full 3" exhaust + 3" downpipe.

if you really want to go far the stock sidemount intercoolers are shit and become heat-soaked VERY quickly investing in a front mount would do you good.

check out www.vwturbo.com