I'm also looking at the PC jointer - it's reasonably priced and a bench top.
I looked at it the other day in the store - looks fine for me - it is 6" though if that matters to you - it doesn't to me.
I will probably use it as a planer as well ( I don't work with boards wider than 6" for the most part yet), until I can afford and make room for a planer as well.
The problem with using a jointer as a planer is that the jointer cannot assure you that the top and bottom surfaces are parallel to each other. A jointer doesn't know anything about the top side when it flattens the bottom side. The result is that the board may not be the same thickness on all edges. The planer uses the bottom "flat" side as a reference when it takes a cut from the top side, so you know that both sides are parallel to one another.
IMPORTANT: The planer assumes that the bottom side of the board is flat. If it isn't, then the planer will press down on it, but the board will pop up again when it emerges, yielding unsatisfactory results. To flatten the top of an irregular board in a planer, you should support it from underneath and run it through with a sled. It is riskier and more time consuming to flatten an irregular board with a planer, something that can be done quickly and easily on a jointer.
The jointer really shines when you use it to square the edge of a board to a perfect 90 degrees. A planer knows nothing about the edges of a board.
Jointers and planers are complementary. When you have both, there is a synergistic effect that enhances the work flow. There are ways to get by if you have one but not the other, especially if you have additional tools that can act as substitutes, such as a table saw or router.
You can also do jointing and planing with hand tools. I have a power planer, and I really wish I had room and budget for a power jointer. In the meantime, I will make do with sleds to flatten irregular boards using the planer. For squaring edges, I found that a hand plane on its side puts a perfect 90 degree edge on flat boards when I clamp them in a shooting board on the workbench. It is efficient and quick. I am currently using an old #5 jack plane, but I am restoring a #7 jointer plane that I bought at the swap meet. If they work out as well as my tests have shown, I may not bother to buy a jointer at all.
Another option for squaring edges is to use the table saw. There are a variety of techniques you can use.
For the record, I have tried flattening boards with hand planes. That requires much
more skill than squaring edges with a hand plane and a shooting board. I will continue to use the power planer for a while longer. :-)