Talk to Chris Adcock at GraphiXtreme, he's a merchant member on here and I believe has the Ding Tec laminator, I think he's had good results with it. For the most part, laminators all do the same thing. Some are easier to dial in than others, some come from the factory better dialed in than others, some have alot more bells and whistles to make them do their job easier or more efficiently, but I'm of the oppinion that even the most basic laminators can be made to operate well, it just takes a bit more user intervention. My point is, talk to someone who can maybe help walk you through the problems to see if you are able to solve it before you entirely jump ship on your current unit.
That said, we have a Royal Sovereign RSC-1400 and are very happy with it. It's fairly basic, but has all of the bells and whistles we needed. It took some time, frustration and hands-on work to really dial it in properly, as from the factory it wouldn't laminate straight for anything, but once we got through that process, it's been dead straight and laminated every print perfectly, unless the user does something wrong. We've laminated entire rolls of media and laminate through it without pausing without problems.
Edit: Chris just posted before me...