I tend to agree with the upgrade route as a viable option. I have a 150 mkII. I went out to listen to tables recently for possible replacement and decided that I would have to spend at least double what your budget is to see significant differences across the board. The used VPI and the new RP6 sounds intriguing, but the $1500 suggested upgrades would probably get you the most bang for your dollar. My 2 cents.
kn
kn