Looking for a good speedball marker

There's some DM3's on eBay for 150-300. I'm actually thinking about getting one myself, I never had any problems with the one I owned.

Also, you can pick up an AKA Viking for $400-500, and even those markers were made 4-6 years ago they are still insanely good.

Also, if you go with a Cyborg, you are essentially buying an evolved Viking. AKA went out of business for patent infringement or some nonsense, and some of the guys from AKA created MacDev (who makes the Cyborg). Although the Viking and Cyborg look nothing alike, the mechanics of keeping everything to the lowest pressure possible is still the same.

Hope this helps out a bit.