Scalable Hosting Needed for Expanding E-Shop

Hey all, I’m planning long-term growth for my e-commerce business and need hosting that scales easily. I’d like to start with moderate resources but have the option to upgrade without downtime. Cloud VPS or similar solutions seem interesting. What providers offer the best scalability and reliability? Any comments on GTHost.com or Hostingsource.com vps hosting services? Will it be worth trying one of them?