I've had the turbo twist's ... and didn't care for them. Burned out quick. several times. Just wasn't all that great. I won't buy another. Have yet to buy a different. Been looking at the AquaUV w/ internal wiper.
(http://www.premiumaquatics.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=AQUAUV-40WT-WP&Category_Code=Aquauv)
The wiper makes it much easier to clean, when having to take the bulb out, i know i didn't clean it as much as I should've.

Scott has the Current USA Gamma UV, I don't think he's had any issues with it. The Gammas are on sale @ Foster & Smith.

Jeo Has some good ones in his shop. I need to get one as well and have been looking but have not come of my wallet yet!