Currently using Stanton T80s, Numark dm3050 mixer and Stanton 500v3 carts. Been noticing my recordings don't sound as crisp as i'd like, and just wondering what to replace first to provide the best sound quality upgrade? Would I be right in thinking replacing the carts would make the biggest difference as mine are 2nd hand and god knows how old they are? I was thinking of getting some high end Shures. I'm pretty sure I don't need to replace the turntables yet as I can beatmatch fine on them (although in the long term i'd like something more solid). Do the actual turntables make much of a difference?