I prefer the humpy bonnet, LED rears, bi-xenons and the facelift interior, but I don't regret buying a 2004 for a second. You can always add the bits you like afterwards anyway. I bought the first one I drove (I know it's a bad approach, but I fell in love), try and get a test in as many as you can and see how you feel inside and when you put your foot down.
The extra tax works out about £20 a month, in the grand scheme of Zed, that's not that much.
Edit: Sorry! I read the title but missed the budget.