Damn it where's 7th gear when you need it?!
Ł400 wouldnt be buying a very good quality set of 18's, unless they 2nd hand OEM's maybe. Cheap alloys tend to be a bit soft & invariably have "Made in China" stickers on them, being soft means they're liable to buckling if you hit a pot hole for example. My advice would be to do the wheels 1st too, but spend some sensible money & get something made in europe, it'll be a harder alloy and last longer!
A4 3.0 Quattro Sport - Gone & missed everyday!
Current road going missile.....
........Smart Roadster - arguably the most fun you can have in a car without using lube!!