Sure you can use them. I'll bet your existing components (if working properly) are better than what you can get for $1500 considering much of that will be dedicated to speakers.
You could get a pair of Green Mountain Europa monitors for about $550-$600 used and have plenty left over for a good CD player. Matter-o-fact, if you get a good CD player with built in volume control, you could get rid of the PAS 3 and go CD direct to amp. The Quad 99 CD-P and Cary CD-308 are excellent choices for CD players with remote volume control and they would be within your budget at about $800-$900.
Enjoy,
TIC
You could get a pair of Green Mountain Europa monitors for about $550-$600 used and have plenty left over for a good CD player. Matter-o-fact, if you get a good CD player with built in volume control, you could get rid of the PAS 3 and go CD direct to amp. The Quad 99 CD-P and Cary CD-308 are excellent choices for CD players with remote volume control and they would be within your budget at about $800-$900.
Enjoy,
TIC