Just to confuse things further, have you tried the Saucony Kinvara? Pretty lightweight, 4mm heel drop. I have the same problem with finding shoes for size 4 very wide feet, and I had to get these as an emergency replacement for Nike Lunarglides just before my first marathon last autumn (should have realised the lunars were on the point of collapse...). Anyway, went up to size 5 for the Kinvara and had no problems at all (shoe-related problems, anyway) running full mara in them with no breaking-in time - no blisters, no heel rubs, no pain.
Not an overpronator, though, so could go either way. Got mine from Up and Running, but if you have a big Sweatshop near you they might have them in or be able to get them. Sports Shoes Direct had them at a good price, but I don't know if they've sold out. Speedy refunds when I've sent stuff back, but you don't get to try them out for miles, sadly.
Ron Hill Tracksters at 2 for £20 at Sweatshop online - read about people wearing them in the What Are You Wearing thread and thought I'd pass it on. Already got mine! They have other stuff as well, but this popped out because I was looking at winter tights at £40 and up when I got the email, so felt like an opportunity. They seem pretty good if you're happy to cut the stirrup thingies off.
See a couple of people have mentioned the Ron Hill Tracksters - they're on offer at a fairly unbelievable 2 for £20 at Sweatshop at the moment. My winter wardrobe sorted out - leggings underneath when it gets as cold as last year...
Nope, don't work for Sweatshop. Think they must be very overstocked and have no objection to taking advantage!