Sounds like a good setup, the only other thing I'd reccomend is a decent drop in air filter (HKS, K&N, Cosworth etc) if you haven't already got one.
That's as far as you can go really without thinking about engine internals or FI, both of which as you've already mentioned are big money.
As long as you get the remap done soon after all the mods are fitted there shouldn't be any negative effects at all, other than your car won't pass an MOT obviously.
If everything is stock at the moment you should see a nice power increase.