If you have an enlarger, I find it is easier to just use that. It is easer to load the negative carrier once, than to keep re-loading the print frame after each test strip.
I had a Solar enlarger in 1973. My Solar was a condenser enlarger that went to 6x6cm. It was an old design back then and I quickly moved on. I'd keep looking for an Omega. Here is a D2 for $50 but it may be too far away for you: http://cleveland.craigslist.org/pho/1653981885.html