The Denon 103 is probably the best budget choice. It has a warm analog kind of sound but it doesn't offer the ultimate in soundstage or detail. I think it is best with a Step Up Transformer and the Audiotorium A23 sounds great with it but it is a little pricey. You could also use a SUT based on the Lundahl LL1933 and be happy.
I also own the ART9XA and ART9XI. I think the ART9XA requires a better turntable than you have to really shine since it's improvements are primarily in soundstage and separation and the arm/table really have to be good to allow its virtues to show up. It didn't sound special with a Technics SL1200GR. But the ART9XI is fantastic with terrific dynamics and a very balanced presentation from bass thru treble. However, I don't think anybody would describe it as warm.
I have never used it but the AT-OC9XML gets a lot of love and it is a much better price point than the ART9 series.
The Dynavector 10X5 would be another good recommendation. This isn't the most resolving cartridge and the top end is a little rolled off but it sounds great and has a wonderful midrange.
Grado Moving Iron cartridges also have a very warm character but my Grado Sonata 3 is too rolled off in the highs for my tastes.
Also, don't get too hung up on all this. Cartridges definitely make a difference but probably less of a difference than most reviewers/users represent. Having said that my cartridge of choice at the moment is the Ortofon Cadenza Bronze.