You are describing a panel saw: http://www.amazon.com/exec/obidos/tg/detail/-/B00006LPP9/qid=1080601120/sr=1-10/ref=sr_1_10/103-7772060-7408635?v=glance&s=hi

I am no expert, but from hanging out at woodworking forums I believe that even experienced woodworkers don't generally try to wrestle large sheets of plywood or MDF onto their tablesaws. They use a good old circular saw and a clamped straight edge or a sawboard. I cut panels slightly oversize with this method, then finish on a tablesaw. If you take your time and measure carefully, you can get extremely accurate results with a circular saw.

If you want a tablesaw (not a panel saw), the best deal on the planet is the Ryobi BT3100. I love mine. Check out http://www.bt3central.com . You can do searches on http://www.woodworking.com and other forums to get views on other saws by the likes of Delta, Jet, Grizzly, etc.

Good luck!

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