When looking for a table scroll saw, there are several important features to consider:
1) Construction materials. Like any shop too, cheap models skimp on materials which result in warps and increased vibration. Unlike, saws, lathes or drills, table scroll saws are particularly prone to vibrate so quality(and heft) of materials used is particularly important.
2) Open/Closed casing. Entry level(read cheap) scroll saw are open so that the dust just falls down to the floor. This design has two issues: balsa dust just flows everywhere and difficulties with mounting the saw on a solid surface(dust falls right under the saw and eventually getting into the mechanics. The more expensive(and much better) design encloses the bottom portion of the saw and allows for hookup of a vacuum.
3) Tilting. Ability to tilt the blade/table is not really required for our needs. That said, table tilting is common but just like any other shop tools, if you till the table instead of the blade, you will end up with surface which is very hard to get perpendicular to the blade. It is better to find a model with a tilting blade instead. Of course, tilting head scroll saws are more expensive.
If you want a good table saw, Excalibur is excellent but somewhat pricey. Like everything in life, you get what you pay for. It has a port for a vacuum cleaner, tilting head(no the table) and of extremely sturdy, vibration isolating construction.This scroll saw is amazing. Cutting with it is just plane awesome.
http://www.amazon.com/Excalibur-Scroll-Saw-16-inch/dp/B004BG13FK/ref=pd_cp_hi_3If $600 is a bit much, you can always go for Harbor Freight model($80). Yes, it's cheap, vibrates like crazy and won't stand up to regular usage but if you plan to use it occasionally(once a week for example), it will be enough. That said, these things are almost impossible to use to cut soft and thin balsa sheets(think ribs). you'll have to cut far away from the cut line and then finish by hand.
http://www.harborfreight.com/garage-shop/stationary-scroll-saw/16-inch-variable-speed-scroll-saw-93012.htmlShopFox makes a nice intermediate saw with dust enclosure and tilting table which is a copy of Dremel one with a few updates:
http://www.amazon.com/Shop-Fox-W1713-16-Inch-Variable/dp/B001R23T08/ref=sr_1_6?s=hi&ie=UTF8&qid=1344551510&sr=1-6&keywords=table+scroll+sawDeWalt also sells a good one but I've never actually seen or used it.