Dear Nolitan: That analog rig you own ( ? ) is a very good entry level on the analog world.
I don't know which are your experiences or what you are looking for on the analog side but reading through your posts I can see that you own a very nice and high quality performance system that will do justice to the analog alternative against what you own on digital source.
If you already have that RB700 I think that you have to add the VTA option ( after market option. ) that is a must to have with the Rega tonearms instead to use those shims that IMHO can degrade the cartridge quality performance.
If the number there is your budget for a cartridge and other than the good alternatives that the people already posted I want to add the MM/MI alternative, here are two samples that could help to your analog sound reproduction satisfaction:
http://www.audiogon.com/cgi-bin/cls.pl?anlgcart&1254595193&/Empire-1000-Ze/X-Nos-Nib--spar
http://www.audiogon.com/cgi-bin/cls.pl?anlgcart&1253551030&/Sumiko-Andante-P-76-New-Phono-
of course that in the MM/MI alternative there are other very good cartridges but these ones are worth to try it.
Regards and enjoy the music,
Raul.