Advice Please On Turntable Upgrade?


Hi all, I would appreciate some advice and direction on what to look for in the way of a upgrade from a Pro-Ject Debut Carbon turntable for my main system. I will be moving the Pro-Ject to my secondary system.  I want the upgrade to be the best value for the biggest difference in sound if you get my drift.   I just haven't been able to pull the trigger and I have been looking to do this for some time.  I listen to mainly classic hard rock, blues, and old school jazz. my main system is:
Aragon 8008BB  dual mono power amp
Aragon Aurum  pre amp
PS Audio P-300 Power Plant
Wharfedale Pacific EVO 30 speakers
Arcam FMJ 37 Super Audio cd player 
Leema Acoustics Essential Phono Stage
I have a Grado Prestige Silver on the Turntable
There are not a lot of good audio dealers in my area so it's hard to go listen. I appreciate any input. Thanks.
zar
Sorry I didn't see you second post on budget - Rega Planar 3 and a Lyra Delos cart or perhaps a Dynavector 20X
Marantz tt-15s1

I haven't heard one outside of a shop but I can personally attest that other people think it's fantastic and punches well above its weight. A used one in good shape will easily fit your budget.  
Pioneer PLX1000 ($700). Use the money saved to get a better (mc) cartridge! I own this TT (among the many in my collection) and for the price it is unbeatable! Very favorably reviewed by Herb Reichert in Stereophile!
Yeah, you're right!   My comfort zone is about $800-$1,200. I'll go up to $1,500 if it's a great deal. Once again, looking for the biggest improvement in quality to make it worthwhile and for the least amount of $$ possible.  Thanks again.