If you know where to look and what to look for, you can find any of the guns mentioned for quite near the $250 mark. The Xocet is about 230-240 new, the RWS guns go from under 200 for the 34 to about 270 for the 48, depending on where you find them. Of course, used guns are a very good option too. I recently came into a Patriot in .25 for $250. The gun had a small scratch on the receiver where the owner didn't know how to properly mount the scope, but otherwise its mint.(21gr domes at 800+fps-whoopeee!!!) You never know what you'll find in the used gun market. (barn-burner full boat FWB124 dirt cheap but thats another story...
) The post below by MAC11700 he says he can get an R-9 with mounts for $250. Thats a pretty good deal.
Chinese rifles seem to be a crapshoot. Some guys like them and the guns they have work good. Others have the same makes and models and they just don't work, or break after only a few shots. I've heard so many complaints about burned seals, metal shavings in the tube, cracked stocks, broken levers, inaccuracy, poor QC etc that I don't think I'd like to spend anything on a Chinese gun again.
I know when I buy a Weihrauch, Webley, or Diana that these problems will almost certainly be nonexistant. I also know that if there is a problem, high quality replacement parts are easily obtainable and the guns are easy to repair.
The Diana 34, 36, etc are all very good guns, well worth the asking price. I have a model 54,a model 50, 2 model 27s, a 25 and a couple other smaller models. All shoot well and are quite accurate, even the small youth model guns. However, the HW guns are what I prefer. The Rekord trigger is what sets them above the others. I've owned 4, an R1 .20 carbine, R10 Deluxe in .177, an Hw 50s in .177 and an HW 35L in .177. All are excellent guns and top contenders in their respective classes.
Gary Barnes makes some real nice guns, but like his knives they are more works of art than something you would use regularly. Dennis Quackenbush makes guns that you wouldn't be afraid to carry out into the woods. I don't think I could justify carrying a custom made $3600+ gun into the brush and risk even the smallest scratch. Dennis however makes some real cool stuff from the lowly Crosman 22xx guns, and other high power guns that are meant to be used. On the numerous other airgun forums, there are owners of both. However, theres rarely a mention of the Barnes guns, but plenty of DAQ action going on. That says something too.