The 1.7 is more than happy with turbo charging. Downside is there is no off the shelf "kits" so you will need to plan and source all the stuff yourself. Cost wise, it won't be cheap to get it reliable, and depends on how much you do yourself and what spec you go for low boost / high compression or high boost / low compression.
Here's mine in action
http://www.youtube.com/watch?v=lPfj5pLGWjs