I have this Grizzly. It's 7" x 12", which is plenty for venturii and spinner parts. I got the 3-jaw chuck, which runs quite true, and inside/outside jaws. The one mistake I made was getting a 1/2" drill chuck for the tailstock. No need to drill 1/2" holes, and it's too bulky for the relatively short bed length. I would suggest a 3/8" Jacobs chuck, not an import. Finding the chuck you want and a matching arbor can take some head scratching.
This is very similar to the Harbor Freight 7" x 10", but the extra bed length is important, IMO. You can also get a 7" x 14" from "Mark Tools" (?). Mark often advertises in MA. Grizzly says that these all come from the same factory in China, but extra precision and other options are available to the importer. Of course, Grizzly says theirs are the best.
Mine works quite nicely, but I usually run it in "low range", which is plenty fast, IMO. I guess I could use my tach to find what rpm I'm actually running, if I thought I needed to know. I have not tried cutting threads, but it came with the gears to do that, plus a faceplate and some other items I've never used. I've made aluminum and Delrin venturii, modified spinner backplates, prop nuts, and spinner cones (that's a trick!), and it always comes out ok. But I did run an engine lathe for a living for a few years. I found that real Delrin is better stuff than Acetal Acetate, which I'll never buy again.

Steve
http://www.grizzly.com/products/7-x-12-Mini-Metal-Lathe/G8688