I guess you could start with the regulator, it'd be cheaper than a new pump and if it turns out that it wasn't the problem, putting new things on your car never hurt anyone :P
I was having relay issues and not too long ago, i was at beaurepairs and car wouldn't start, walked all the way up to Honda with my relay (2km up the road), and they didnt have any. So i walked all...
Might be worth noting that your FITV (Fast Idle Thermo Valve) -OR- IACV (Idle Air Control Valve) may need cleaning. Below I have posted a link to help you do those yourself! Seriously, if you haven't...
There's a few pretty cheap and clean DA's on Gumtree dude, one's a 92-93 and I think 1 or 2 other's are pre-facelift 90's. I'm sure only 1 of them is manual though.
There's a grommit in the middle of the firewall behind the Intake Manifold, that is EXACTLY the right size to plug the hole where your rear wiper sits. Good little addition if you're planning a rear...