I bought an Innova a couple years ago, to replace a Nolting Fun Quilter, and have been delighted with it. I looked at a number of brands, but chose the Innova after using it in a class at MQX.
It moves easily and smoothly in all directions, it's easy to adjust stitches, and the stitch regulator is great. The stitch quality is excellent, tension is easy to adjust, and I've run a number of different threads with no problems. It doesn't need oiling, except at the bobbin. I have a 12' table, which will do a big king-size quilt. I don't have a computerized system. I did recently buy hand cranks for the rollers, but haven't installed them yet. Innova has excellent, 24/7 phone technical support available.
The only thing I think would like to have at present is their Spectre Light add-on (the lighting in my quilting studio leaves a lot to be desired), but it's not really necessary. A hydraulic lift would be nice, but its cost isn't warranted for me. The bobbin winder that comes with the Innova works fine, but seems a little flimsy (plastic) and slow compared to the Nolting one I had before. It would be nice to have an automatic thread cutter and built-in channel locks.
Whatever brand you decide to buy, you may find that the price is negotiable -- I did! My dealer was also willing to throw in some accessories to help close the deal.
Things you would probably want to have (if they're not included) would be a good supply of bobbins, a horizontal spool holder (in addition to the vertical cone holder), a TOWA gauge to fit your bobbin size, and a supply of needles in several sizes. You also may want to get a few basic rulers to get you started. Micro handles are very helpful; I use mine a lot. If it's not built-in, you should have a laser light if you want to do pantographs. Again, once your dealer feels you approaching a decision -- particularly if you say you're looking at other brands or are wavering --he/she may be willing to give you some or all the extras you want. It certainly doesn't hurt to ask!
If your dealer is nearby, it may be worthwhile to have them set up the machine for you; then you'll know, at least at first, that it's working correctly. You may also be able to get some hands-on training at the dealer's.
If you have a chance to go to another big show before buying a machine, try them again -- it won't seem so confusing the second time around. Get the literature from each one you're considering; compare the features and pricing. Look online for info and reviews.
Good luck!