Congrats on the used car equivalent, I'm sure you'll have more fun and less trouble with the 830! As for thread, I agree with Tartan that strength, wt and LINT are my main criteria.
If you or someone you know, is good with power hand tools (mainly a jig saw and drill), I used a 4' x 4' piece of 1/2" white melamine (cut down from a 4x8 sheet), added flanges and used 1" pvc piping for legs (with caster wheels) and cross members. I then cut out the profile of my machine a few inches from the right corner and lowered that cutout down about 3 inches to make the level of my presser plate a little lower than the level of the table (with some cardboard for fine-tuning). I then used some brackets to secure the lowered cut out to the bottom side of the 4x4 table.
This set up has lasted a LONG time, has given me enough room to FMQ King sized quilts and under normal conditions, gives me room to use my big rotary cutter mat at the other end of the table. It was cheap but did take some work.