Thank you all for the thorough explanations and options.
Here's the bottom line...
I want something to perform as well as what I have, be a bit better at handling things that need more processing power (the odd game and some Sony Vegas and Sound Forge render functions can lag just slightly enough to be annoying), and will last for several years. You can clearly see I take good care of my hardware.
Let's say I was willing to throw, I don't know, $400 bucks at this. Would you all still recommend the same thing? (Keep in mind things here in Canada don't always cost the same as in the US. Sometimes more, sometimes less.)
And also, with overclocking, I've never read anything about overclocking that makes me feel like the longterm effects (even if they're only risks) are worth the immediate benefits.
There's a lot of pre-Black Friday sales on Amazon and NewEgg Canada right now, I'm thinking I could probably swing something now.
If you don't want to overclock, then it's probably not worth going for a 3770K, unless you can get it really cheap. The hyperthreading might help a bit, but any considerable performance increase would have to come from pushing the clock speed up. Whether you will notice a speed increase in Vegas or Sound Forge will largely depend on how multi-threaded the workload is in those programs. For example, I noticed very little difference going from a 3570K (4 cores with 4 threads) to a Ryzen 1700 (8 cores with 16 threads) when editing in Lightroom and Photoshop, but the imports and exports are much faster on the Ryzen machine. To get a big single thread performance increase, you'd have to get something from Intel's 8th or 9th generation. To get a big multi-thread performance boost you could go with the cheaper Ryzen options. It really depends on what's causing the slowdown you don't like.