Hosting Advice for High-Traffic Online Store?

[Nickindred]

Hello, my e-commerce site is starting to get higher traffic, and my current hosting can't keep up.
I'm looking to upgrade to something more powerful — possibly a VPS or dedicated server.
Performance during peak hours is critical. Do you think Rightservers.com VPS will be a good solution for me?
What setups or providers do you recommend for handling large numbers of concurrent users?