Best protrait lens for my budget is...?

Well I normally only shoot Minolta, and normally only buy used lens. I was disabled in the Iraq war, have four kids, and my wife supports all of us plus my disabled mother on one income. So my dollar really has to stretch.

My budget is $200-$350.. but I need to stay as close to $200 if at all possible.

I was looking at the Minolta Secret Handshake but only found one on ebay and seems like it will go over my budget. I posted a wtb thread in the for sale section as well.

I am interested in what you all think would be a good portrait lens for me. I need something that performs well in lower lighting. Primarily interested in Minolta and other suggestions are welcome too.

My gear that I already have:
A65 (save a year for that baby)

Minolta: 50mm 1.7; 70-210mm 4.0 (beercan); 75-300 4.5-5.6 (big beercan); 35-70 4.0 (baby beercan)

That's what I have, beercan is excellent for outdoor portriats, but I shoot indoors alot and space is limited.
Thanks in advance!
Best Regards,
Gary
--
"We can do no great things, only small things with great love" Mother Theresa