i needed to know what kind of springs can i use for my rex?

What are you planning to do? Lower it, stiffen it or both?

both, are there any out the4re?

For stiffer front torsion bars and Tokico Illumina adjustable struts, check out OPM @ www.opmautosports.com
OPM also makes an adapter that allows you to use a smaller diameter spring in the rear.

For progressive rear springs look for Eibach or Tokico. These pop up on Ebay quite often.

For stiffer adjustable rear springs that will fit without an adapter, check out Ground Control @ www.ground-control.com

Energy suspension makes a polyurethane bushing kit for the 1G Civic/CRX. www.energysuspension.com

You can find some info on lowering here:
http://www.automotiveforums.com/vbulletin/showthread.php?t=199192

For inexpensive stiffer front torsion bars go to your local junk yard and grab the front t-bars from an '84-'87 Civic wagon or better yet, an '84-'87 Civic wagon AWD. The wagon t-bars are about 3/4" longer but will fit without modification and are a bit stiffer than the stock CRX t-bars. Don't confuse the wagon and hatch back models. You won't gain anything by swapping the HB t-bars.

Also the '86-'89 Integras use a stiffer front and rear sway bar. The rear sway bar is located in the rear trailing beam, so it's best to swap the whole beam.

Also check out www.redpepperracing.com
There are several members there that make parts such as adjustable rear panhard bars, camber kits, carbon fiber parts, etc.

Focus on stiffening the rear first, this will eliminate understeer. In fact if you're on a budget don't do anything to the front at all, just lower it.