Best Cartridge for Rega RB 300 and RB1000 ?


I own both arms and I will use both on 2 different tables. Unfortuntately, I don't know waht to look for when it comes to specs, i.e., tonearm mass, compliance, etc. However, I know what i like when it comes to what I'm hearing.
Currently, a Denon 103 is mounted on the RB300. To me it has very good soundstage, tonal balance, attack and decay. Bass is deep and articulate with low passages very quiet. I like the combo very much.
The RB1000 is still new in the box. Plans are to mount it this Winter, but I have no cartridge yet.
Any and all advise is sought from all.
Thanks for your time and effort.
oregon
I had a Benz Glider and then a Cardas Heart Reference on my RB300 when I had it. They both retailed for more than the arm, the Heart especially, but they sounded great. The Heart is also a Benz, by the way.
The Ortofon Vigor is a European HOMC that is packaged w/the RB300 by Acoustic Solid (from whom I recently bought a table/arm/cart). The combo works very well and this cart (or US equivalent Ortofon HOMC) represents good value at its price point - app. $250. I later swapped out the Ortofon for a Clearaudio Aurum Beta S (app $500) from another table I own and found somewhat tighter deep bass and fuller mid bass for the effort. Net, I definitely prefer the Clearaudio, but would have to admit that the Ortofon probably represents the better value.
Paul,
Thanks for he suggestion. The idea has intrigued me. Which arm have you used with the Denons?

Docsavage,
Thanks for the info "RGB1000 has an effective mass of ten." What does this mean in terms of which cart to use, what should I consider as far as mvolts are concerned? Also, any particular model of VDH?

Tobias and Martykl,
Were you able to compare the carts you mention to the Denon 103?
Oregon, I've never heard the 103, sorry.

FWIW I've heard Dynavector carts in other people's RB300s and liked them a lot, especially the 17D2. BTW if you haven't had your RB300 rewired, it is very much worth it IME.