Servicing wise a few years ago there was a bit of an issue with dealers refusing to touch imports, but I think the government had a go at them and now most warranties cover the car no matter what country it was bought from. Knowing Renault though, they will probably still be a bit iffy about it!
If you are looking to get money off of list price and are worried about imports, I bought my car from a company who basically buy in bulk from a particular dealer and so manage to get massive savings. Only downside is that they have to register it before you and put delivery milage (@ 50 miles) on the clock and so you are technically the second owner. However this is offset by the 10% (might have been more, I cant remember!) saving that I got.
[Edited by Malibudave on 02 March 2005 at 4:08pm]