I used this psu in my last build and it was excellent:
Corsair HX 520W ATX2.2 Modular SLI Compliant PSU (CMPSU-520HXUK) £68.14 inc VAT
how about this for a screen?
http://overclockers.co.uk/showproduc...odid=MO-054-SA
considering it is for music making, i guess colour accuracy isn't a concern?