Yeah they're alright, Think you're gonna struggle to find a good un if you're only gonna spend 7k, You'd be better spnding a couple of grand more and go for the Mk4, more solid and means you'll be able to post on here,
If you can go up to 9 you could even get a Lupo Gti, these look fun, but very small,
The polo s not much of a GTi though, will not compete with 206 GTi or any other small hatches.
Diesel would be a good bet for long milages.