You should be able to get decent money for your vintage LP12 provided its in pristine conditions. Having the original box/papers/etc really helps kick the price up a notch.
Before you do anything, visit your local dealer and try other TTs. Who knows, you may end up keeping your LP12.
If you are looking for simplicity, the $2,395.00 Wow XL is one solid piece of precision German engineering with easy switching from 33 to 45 RPM that sounds too good to be true.