Rega TT owners - phono suggestions?

Enjoying my new Rega rp6 very much.  Super quiet and smooth presentation.  Wondering about phono upgrades in the near future.  I am currently switching between a Graham Slee SE Gram amp 2 and a Jolida JD 9 2 tube preamp.  Both sound good, surprisingly similar actually, but I think I am leaning towards the ever so slightly cleaner presentation of the Gram amp.  The rp6 is kind of mellow, at least compared to my old Dual 1219 that is.  Cart is Rega Exact.  Not much experience with analog gear so looking for suggestions - from Rega owners primarily.  I've read through the past threads, looking for more current suggestions.  Budget around +- 1k I guess for starters.
Thanks