US Hosting for CS-Cart

I just wondered what servers you guys were using for your CS-Cart software? I have seen info on VPS servers, HostGator, ServInt, Wired Tree, Future Host, Clook, and Martfox.

I am looking for a USA based hosting company that will be able to handle the CS-Cart shopping cart with no problems and load all pages within a second or two.I currently get 500-600 visitors per day, and I am looking for something that can handle that.

If you could give me suggestions or what you use I would be very appreciative. If you wanted to PM me your hosting company and your site that would be awesome. (I will not repost your sites). Thanks.