New: Type-X Reference ~ $180 on
eBay.
Slightly warm tone, light and detailed sound, smooth tweeter. The woofer is well detailed with very good low frequency extension a solid 6mm one way xmax(10mm xmech one way).
Used: Piioneer PRS ~ $230 on
eBay, less used.
More neutral tone, neutral, natural woofer, lifelike sound, transparent, tweeter detailed but not harsh, slight dark tonality on tweeter. The woofer is frankly outstanding. The tweeter and x-over are ok. The set as a whole works quite well.
I too would lean towards the Pioneer as a very awesome set if you don't mind the few bucks. However, Alpine's Type-X sets are also oustanding in its own right. I just like the more neutral/natural tone of the Pioneer set.
The PPI set is well loved too and affordable. It's a rebadge of an old A/D/S/ set, and is highly regarded. I haven't personally listened to a set, so I can't comment.