VPS Hosting Panel Is Best?

I've been with Futurehosting for some time now, and have been very happy with them, but am having issues with 256 guaranteed RAM and cpanel, they've been very helpful, but I've been thinking about other control panels besides Virtuozzo, since I seem to have this issue frequently.

what do you guys think, do you guys like Virtuozzo? or do you prefer Xen, OpenVZ? what do you guys like?

I seem to have frequent issues with their not being enough RAM available to run the control panel, and I'm thinking it may be Virtuozzo related, in which case, I may want to try someone else who runs a different control panel possibly? I don't know

switching providers would be difficult, as I can't see myself getting a better price then I already get with Future Hosting right now, but I'm just thinking its gotta be Virtuozzo related, its gotta be, and I've heard with OpenVZ its got a panel where it will install applications for you, so you don't have to mess with compiling or yumming for stuff, that would be neat.

what are you guys opinions on different VPS control panels?

I mean, its either that, or go up to 512 guaranteed, 1024 burstable, which I don't think will still help any. I get service crashes all the time because there isn't enough RAM available to run cpanel basically, and my websites take up less space then most $1 shared hosting plans, which seems puzzling as to why this happens so often, so I'm thinking its gotta be a Virtuozzo issue of some sort maybe. I mean, I don't even use a gig of bandwidth every month between 3 domains combined. well maybe a gig combined at most, most of my sites clock out around the 450mb mark by the end of the month.