I have the Ace Spacedeck with Ace Space arm. Never had any problem with hum (in fact, first time I've heard that), and quite honestly, the overall setup is pretty simple and straightforward. Proper attention needs paid to what it sits on, but that can be said about most turntables. I've never heard your current 'table so can't comment on what sound differences would exist, but I love the way my Nott' brings across the music. Expressive, rythmic, dynamic, and gets the goosebumps popping and foot tapping. I've had a number of 'tables in my audio life -- some cheaper, some more expensive -- and like the Nott' the best. It just pushes all my buttons (which is a subjective, personal preference thing to be sure) Wide range of cartridges: Benz Lo2, Benz MC-SCHEU, Cartridge Man Music Maker, Grado Reference, an Elac and a Goldring I can't remember the models of, Zu modded Denon DL-103, and currently a Koetsu Black. The Ace Space arm is medium mass, so low compliance carts like the Zu and Koetsu need a little extra mass at the headshell to get the resonant frequency right.
A couple things I don't like, but live with and work around: there is no azimuth adjustment on the Ace-Space (or any of the Nott' arms, as far as I know). You can reportedly twist the headshell in the arm tube to change it, but I couldn't get mine to budge, and even if I could that's a ridiculous method for adjusting azimuth. But there's a workaround for that. I'm also not delighted with the way the arm post mates with the armboard. There's an outer collet that you snug in with setscrews to secure the arm in place, but with the tolerances involved it's easy to cock the arm out of perpendicular as you tighten the setscrews. Possible of course, just something that needs paid attention to. But all that said, I'm not sure there's any analog rig in this price bracket that has every aspect nailed to perfection, so it comes down to finding the sound you want and the tradeoffs you're willing to live with.
A couple things I don't like, but live with and work around: there is no azimuth adjustment on the Ace-Space (or any of the Nott' arms, as far as I know). You can reportedly twist the headshell in the arm tube to change it, but I couldn't get mine to budge, and even if I could that's a ridiculous method for adjusting azimuth. But there's a workaround for that. I'm also not delighted with the way the arm post mates with the armboard. There's an outer collet that you snug in with setscrews to secure the arm in place, but with the tolerances involved it's easy to cock the arm out of perpendicular as you tighten the setscrews. Possible of course, just something that needs paid attention to. But all that said, I'm not sure there's any analog rig in this price bracket that has every aspect nailed to perfection, so it comes down to finding the sound you want and the tradeoffs you're willing to live with.