I"m a cheap skate, but I'd swing for the Optoma HD20.
Definitely avoid business class PJs at your price. It wouldn't be an upgrade at all.
If money is tight then wait until it ain't tight. PJs are a short life product you won't get your money back.
I suggest you hold off spending until you got a nice cushion moneywise.
I love this hobby as much as the next guy, but rent and eventual retirement comes first.
If you do things right in a couple years you can get a really nice PJ instead of a bottom feeder.

Think long term.