[Ted S]

I consider a site "big" when it's pushing a a half million or more posts, 25,000 users or more than 25,000 unique visitors a day, but everyone has a different definition and based on your niche, big may be much smaller or much larger. But for the purpose of this point big refers to hosting needs, not site rank or scale.

In terms of hosting needs, your site is small enough (by usage stats) do be fine on most any server. I would recommend trying Softlayer.com as they provide a great product and at a fair price. One of their basic servers 9single layer, dual core) with upgraded memory (2+ gb) should work fine. With these specs you should have no problem growing substantially before you have to make any major moves.

However, softlayer is unmanaged which means you have to handle things yourself should something break. If you don't have the time or ability to manage a server then you will need to seek out a much different provider which tends to cost a whole lot more.