I'm going to listen to advice and get a portrait lens instead; I'm going to test out a 160mm CB in the next few days and I'll see how I like it. (I went with the 160 instead of the 150 because it's supposed to be nicer to use hand-held and was a bit cheaper, as well as newer; I also doubt I'll notice a difference between then two, at least not at the size I print at.)
Thanks everyone for your help. By the way, if anyone is interested in a near-mint Vivitar 2X converter, I'm probably going to be selling that off; I wont need, or want it, if the 160 suits my needs. Most likely my selling price would be around $110 or so.