Jointer/ Planer combo machines come in two flavors: Large, heavy duty machines with induction motors that can handle wide stock costing $2K - $4K, or small lightweight machines with universal motors costing $500 - $1000. JET and Rikon make machines in both categories. The lightweight machines can generally only handle material 8" or 10" wide, which is good in terms of jointing but not in terms of planing.
In general, people tend to be disappointed with the lightweight machines. They can be difficult to set up/ change over, have limited power, and are not always the most durable. You might be better off just buying a regular planer, and do the jointing by hand or using a planer sled. You'll spend less money and get better results. You can also edge joint using a router (router table or straightedge).
Inca used to make a good J/P machine, but it has been discontinued. If you can find a used one, that might fit your needs.