You can also find some early Mk4 turbos with a 180bhp engine.
The Mk4 is more modern, and the 1.8T engine is very tunable, but the Mk3 isn't a slouch.
The Mk3 16v is 150bhp (same as the later 1.8T) and lots of fun, the VR6 will give you a smile cos of the noise, but it's a heavy lump and only a little more power than the 16v.
The standard Mk4 looks very plain, but modded nicely, can look stunning. Seems very easy to go wrong modding the look of a Mk4 whereas you can get away with more on the Mk3.
It's up to you.