New Rega P10 setup

 "I purchased an open box, no cart for $2,500.00 less because that's what I can afford right now"

10-4. Didn't interpret your OP clearly. I'd simply try all your existing carts and see what sounds the "best" to your ears. Looks like you got it for a decent markdown.

I wouldn't bother with any other carts, IF I were using Rega. Goes against the principle of using Rega-Good table/easy cart install/no fuss setup=play records.

Use Rega to escape audio insanity-not that there's anything wrong with it.

I guess I wont be setting up a Rega P10 this weekend, they sent me a Planar 3 by mistake. Oh well. 🙄

Few turntables isolate themselves from footfalls on a hung floor. That is what wall mounts are for.

How old is the Linn? If it was set up correctly originally there should be no changes required. My dealer does setups. He observes “not setup correctly” is frequently washers upside down or in the wrong place. Really dumb stuff.

I look forward to hearing your impressions when you get your new table.

I have an upgraded 25 year anniversary Linn LP12 (I'm the original owner) with Radikal power supply, KEEL subchassis, Ekos SE arm and Akiva MC cartridge.  I also have a Rega P10 with Apheta 3 cartridge.  The turntables are in different systems and I've not tried comparing them in the same system.  I love both of them.

The LP12 is on the main floor (suspended above my basement) on my audio rack.  I can make the LP12 skip if I jump near the turntable but if I walk by it, no issues.  The P10 is in the basement (carpeted with padding) on my audio rack sitting on top of a Butcher Block Acoustics maple platform.  No issues at all with my P10 skipping.  I could jump rope in front of it without it skipping.

Like many above, I highly recommend the Apheta 3 MC cartridge.  The sound quality is fantastic and there's no fussing with it.

The P10 is in a system with Cornwall IVs and a Luxman EQ-500 phono stage, and a Enleum 23R amp.  I love the sound of this system.  I also swap in my other speakers, Sterling Broadcast LS3/6, from time to time and when I do I switch to my Audio By Van Alstine 600R hybrid amp.

@marktheshark

No matter the cartridge you use, the P10 will greatly benefit from sitting on a proper platform.   On top of your rack is fine, as long as you use an additional platform, turntable specific.  I highly recommend the Symposium Acoustics, model Segue ISO.  For the size you need it's about $400 and that will be the best $400 you can invest for your analog front end.  You can contact Peter (owner) at Symposium and he will be glad to advise you on the proper size, etc.  You can also step up from the standard Seque ISO by getting the Stealth model.  Peter can explain the difference and the benefits.  Enjoy the journey.