I'm not sure what you mean by a tactical mechanical watch, but Poljot makes some very nice watches in that price range. I just picked one up on eBay. Check them out on
poljot.com in the Aviator chronographs section. You might like the Aviator with the blacked-out case. The prices on that site are a little high, but
russiansouvenirs.com has good selection and price, or look around on eBay.
Aviator Poljots are water resistant to 3 bar, so you can't go diving in them, but they'll stand up to rain just fine.
There is a Swiss Army Officer's Mechanical watch for about 300 bucks that has an automatic movement and a sapphire crystal (the Poljots are mineral glass) but I don't think it looks as good, and the mechanics aren't in the same league. No chronograph either. Still, it's probably worth checking out for comparison.
Anyway, I just found out about Poljot about a week ago. I did some digging about them and came away highly impressed. I have no doubts that the quality exceeds that of many production Swiss watches such as Tag Heuer.
Come to think of it, Oris makes some very nice watches too, but they are very tough to find at that price. I've seen a few go on eBay for pretty cheap, but I'd still rather have two or three Poljots for the money. Take a look at an Oris BC3, though. I think they're pretty sweet.
Or you could buy 1/8th of a Bell & Ross.