The going rate for a professionally rewired Xenon (silver Audio Origami, say) is around £350 best; for an HR100 S (silver Audio Origami) you will pay £550 - 650. A Xenon w/o the rewire would be £200 - 250 and the HR100 £400 - 450. The way people are getting hold of them is to watch out for say a Logic DM101 to come up with an Alphason on it ( as they were often paired together in the old Linn heyday) and buy the pair and then sell the TT on. My HR100 was originally on a Roksan Xerxes but the seller split them. The Xenon came from the Wam classifieds. Speedysteve did the rewire on the HR100 and the Xenon was already done (A Origami invoiced).
On reflection a Xenon would go well on your Rock (visually as well). But there must be quite a few others that would suit eg A Roksan Tabriz which would be about £250, a unipivot if you like them or, say, a Helius.
The Rega doesnt suit because apparently the combo is a bit sat on soundwise and logistically it would be difficult to set up because the lack of arm height adjustment.
Im not great at pics but my post is crying out for them so I'll do my best.