Hiya,
You have lots of options really, you will want high impedance injectors for a start (so nothing from a cosworth), with a BSFC of 0.55 and a max duty cycle of 85% an injector calculator suggests an injector of around 340cc (for 200bhp).
From Personal experience I would suggest looking for vauxhall vxr 480cc injectors, nice and cheap (under £100) and perfectly man enough for just over 200bhp (I believe Karlos_G on here used these at 230bhp) so some scope for future improvement.
However these don't look too bad
http://www.ebay.co.uk/itm/ROVER-FOCU...item27c38f2bc7 although i couldn't comment on the seller etc.
Good luck
Rob,