According with the info he gave us, his motherboard doesn't support AM3+ CPUs. He wants a cheap upgrade for the moment.
Going from AM3 to AM3+ is not an upgrade, AM3+ is as dead as AM3. He should go for FM2+ or LGA1150.
I donna why but I have a feeling AMD is gonna ditch FM2 as well and go on some new escapade. Now that I think of it I would just wait a month or two just to assure yourself of where AMD is headed.