[azn_romeo_4u]

I'm not trying to tease you or anything. Just saying. IMO it is a waste of money, unless you're like some video site. Uploading videos and converting it or using one of those other boxes to do the conversion whatever etc.

I'm at about close to your range, with about 750k uniques a month on one server. I'm doing like 90gb's of transfer per day. I'm using instead of apache,

www.litespeedtech.com

If you're using cpanel or plesk, it supports that. Works way better than apache at serving php, and static content. I'm running a version of it that cost 45 dollars a month. I did the switch a few months ago. Works wonder. There's a more expensive version, 100 bucks a month that lets you run 8 core cpu's. I'm running a 2 core version.

I think you should look into it. It's 30 day money back, with a 15 day trial on the 2 core version, so you can basically run this thing for 45 days for free.

Easy to install, works with a lot of stuff like memcache, apc, xcache, eacellera, mod_security, sohusian etc. They also got a load balancer solution.

There's other options like http://nginx.net/ if you don't want to spend money. I know a forum that has this installed, that runs with 20,000 concurrent connections. Suppose to handle 100,000 connections find apparently O_O.