I've got a Jpoint on a pistol, and it works great; currently JP Rifles is selling them direct for $250 on summer sale, but you also have to spring for the base mount for more money.
I'm also in the process of buying a Burris Fast Fire Reddot, which is a clone of the Jpoint/Dockter and can be purchased for $180 from Midway, plus it comes with a picatinney rail mount or $200 for an integral pic. mount. Other mounts are available for various pistols for about $50. I'll be mounting it on top of a Leupold 3-9 for best of both worlds type shooting: the Leupold for longer distances and the reddot for quick, close up targets.
You might also want to check out some inexpensive reddots, such as Simmons with an integral Weaver mount: about $30 also at Midway.
I also have a Hakko reddot 1X on my Beretta Storm, but it's no longer made. I use it in Tactical Matches on steel and it's very fast. It's more like a heavy duty J POint.
Keep in mind that the typical reddot is usually 4-8 moa, which represents a 4"-8" dia. dot at 100 yds. As a result they are meant for visibility and speed, not precision.
Reflex sights (e.g. Trijicon with the triangular ret.) which generally cost more, have other types of illuminated reticles, which may allow for better accuracy. But you're looking at 2x-4x increase in price!
Hope this helps.