Sti will always be better if u wan go further mods wit it. But if u like the 2003 shape instead of a Bug eye, go for it. I personally will choose a 2003 wrx coz it is a newer shape

Not huge dif between wrx and Sti tho, let say u could save up for around $3500 for getting a 2003 wrx wit some mods, use the ress of money on a better turbo and a used ecu wit gd condition would be great. If the 2003 came wit an ecu is even better

Gd luck wit ur purchase.

Cheers,
Yeah