how much should I spend to get a better turntable than my current turntable?

Check your PM as to a TT for sale here on A'Gon slightly less then your $400 budget.

DeKay

Never mind - it's an auction (thought is was a "buy it now") and the reserve seems high for a used deck.

DeKay

Rega P2 is an easy recommendation. I had the P2 and it’s a solid table. A bit above your budget if you can stretch it. If you choose to buy new I suggest getting it from Upscale Audio and have them either mount whatever cartridge you decide to get or if you want to get it as a bundle with Rega cartridge have them check the table and cartridge. Free service. This alone is worth it if you’re not experienced with a turntable set up and or don’t have the proper tools to do it. They have a 60 day return policy if I am not mistaking. 

@audphile1 

I guess it comes down to the Fluance RT85 and te Rega P2, which one is a better value, and which one's looks I prefer. (Besides the other 4-5 options)

I had a 1200 series Dual and replaced it with the MMF-7 which was much better. If you have a $500 budget This is one of the best Dual TT’s ever made according to many. What you have now is the very bottom of the ladder TT's.

Dual 5000