You'll want to match your PJ's native resolution (16 x 9) and I'm not sure how that screen is measured. Of course that type of setup is adjustable. Also check and see if that screen is high-contrast or not.
I'm a fan of a fixed-frame screen simply because those screens which are suspended can sway back and forth with not much of a breeze at all (your air conditioner is probably enough) which can be distracting to you (the viewer).
If you're really on a tight budget, there are several DIY solutions which work well in a pinch until you can afford something better and most can be built for anywhere from $50.00 and up.
Do a little research on Google, Ebay, and AVS Forums and you'll see what I mean.