I bought mine is slightly scratched but otherwise excellent condition for £275. They are out there, just look carefully. Ask the seller some very specific questions and use the answers to hold him to account if the frame is not as described.
You want to know the following:
Is there any 'marbling' of the anodising? (indicating stress or bending in a specific area)
Is there any gouging of the metal because of crash damage?
Has the BB sleeve ever been replaced? (this can be due to ham fisted BB installation, however it is a common place for Pace's to crack and they could be making a problem)
Has the frame ever been welded? If so by whom? (Pace have replaced tubes for people. Your mate Darren cannot!)
Is the finish original? (Many people have had theire Pace's customised over the years, including a few people on this site. However view a non standard finish with a degree of caution, if everything else is fine, then proceed, if there is any doubt walk away.)
Do the headset cups fit snugly? (the frame may have lead a very hard life and the lower race an sometimes spread the frame)
Hope this helps.

_________________
Somerset, like 'Heartbeat' with newer cars!
Retro MTB: 1992 Cannondale M1000 Deore XT M730. 1992 Raleigh Dyna Tech Quantum Deore XT.
Retro Road: 1992 Eddy Merckx Corsa Extra Telekom Shimano 6400 Ultegra. 1993 Dyna Tech Ti Campagnolo Athena 8 Ergopower.
Modern: 2004 Wilier scandium Ultegra 6800. 2014 Wilier GTR Dura Ace 9000.