You can find exceptional deals at http://www.chronoshark.com/ but they are a one deal a day site, so selection is limited. The deals really are exceptional if you can wait for something you like. I’ve ordered from them before. Delivered in a week, no issues at all.
I’ve heard very good things about http://www.christopherward.co.uk/ watches, but I have not owned one or even checked one out in person.
Brands are usually not important to me. I buy what looks good and meets a few basic criteria:
Sapphire crystal. Must have. Hardened mineral crystals scratch and look like crap over time. Sapphire is almost impossible to scratch. Also, a sapphire crystal usually indicates a significantly higher than average quality of the piece. In my experience, anyway. This is an absolute deal-breaker for me. No mineral crystal.
Quartz movement. Personal preference only. Japanese or Swiss Quartz are both fine in my book. Automatic movement usually puts you in very high quality watches. Automatics are very nice, and automatic movement with a view window can really add to the aesthetics of a watch. Plus, no battery to deal with. I just don’t like that I have to wear it almost every day to have it keep time. Of course, this does mean that you can buy him an automatic watch winder for his birthday.
Clasp. I really like a butterfly clasp on a bracelet. Again, it’s a personal preference. This is another feature that I think is an indicator of higher than average quality. Does not pertain to leather bands.
Material. No gold accent. How long will two-tone watches be so common? Butt Ugly! My current watch is tungsten and nearly scratch proof. It’s heavy, though. Before this, I’ve never owned anything but stainless. Stainless will scratch. I’ve heard platinum is pretty indestructible also. Others prefer leather band, and I hold no grudge against them for it, but I prefer a metal bracelet.
Face size is a very personal preference, and probably the most important to many people. I usually wear 44/45mm diver watch but I have big wrists and like the way a heavy watch feels. It would probably be wise to measure a watch he likes and stay within a few mm of that.
There are a lot of very nice watches in your price range. The hard part is finding the right watch for your husband’s taste. I’d look very carefully at what he’s wearing now, especially in terms of size and material.
You may try to trick him into telling you what he likes if you think you can get away with asking his advice on someone else’s behalf. Good luck!