<font color='#8D38C9'>It depends on your budget & listening preferences. If you have a lot of vinyl you might wanna aim a bit higher than a Yamaha 'table. Just what you buy of course will depend on your budget. Music Hall makes some very good 'tables at a wide range of price points; a guy I know @ AC copied one of my LPs to CD-R for me on his MMF-5, and it sounds great (I've got only a scrub of a TT- I've only got 50 records nowadays, not worth buying another 'table for them).
Depending on how current the DACs are in your receiver, and upsampler might be a good upgrade. Monarchy's Dip upsampler is about $300, and GW Labs sells one for $400 thats got some pretty good feedback.
Speakers would be the obvious upgrade. Again, personal taste will dictate what you buy, but there's a lot better than AR, IMOHO.
Probably the best upgrade would be some room treatments. Several guys I know have bought Roompacks from The 8th Nerve- the cost was $269 for a pack that will treat a 'typical' room, and the result were amazing.
Just some suggestions.</font>