Trade it in only if you want to be able to connect your TT directly to a computer. Otherwise there's no point. Either one comes pre adjusted out of the box. Just make sure you have a receiver or intrgrated amplfier with a phono input.

I would just keep it. Not sure if you have speakers, but you can go about this several ways. I would vouche for a Marantz PM5004 ($449) if possible. It has a great phono preamp and can supply great power. Pair it with the Wharfedale Diamond 10.1 speakers ($349) and you'll be set. Just don't forget stands. Then just upgrade your platter to the Acryl-it from Pro-Ject and maybe add their Puck and you got yourself a nice system.