For nearly £500 you could get a much better looking set of alloys. Out of your two choices I would go for set 2 BUT my advise would be to stick to some OEM VAG alloys... lots of them seem to suit the Mk4 Ibiza. Have a look through the thread in the Mk4 Ibiza FAQs section for some ideas....
 
like mike said i'd stick with the VAG range of wheels, i have some RS4 replica's on my old mk4 and they looked good. got them off ebay for £400 with tyres too ;) i also like the RS6 wheels as well.