[corsona]

My parents own a Sony PS LX-500 turntable with a Stanton L272 stylus as well as a STR AV-710 Audio/Video Control Center for the amp.
 
I already own a pair of KRK 6400s, which I plan on using instead of speakers as I'll be moving into a dorm in the near future.
 
I've also found a Technics SL-3300 on craigslist for $75. I'm not sure about its cartridge, it's red and doesn't appear to have a brand or model number on it. Pictures/listing here: http://wichita.craigslist.org/ele/2934563108.html
 
So...
Does anyone have any idea about the quality of the stylus on the Technics TT?
Would the Technics be a significant upgrade from the Sony?
Is the Audio/Video Control Center a decent quality amp or should I look for something else?
Any other recommendations for this setup?
 
Thank you for taking the time to read this, I really appreciate it.