I'm going to annoy you now.
Maybe you have already, I dont' know, but my advice would be to talk to Chris and see if there's anything he can do. I've been with a lot of hosts - far too many in fact - and you aren't going to find any better, or more secure, than where you're at. I'm not sure it's going to worth your while to move your high-demand domains onto some oversold budget host.