My dedicated server setups now are rather more complicated in several ways.
I run my own email and databases via cPanel (or, in our second server, Plesk). While external email isn't an issue (although our spam management is good), I'm comfortable with our own MySQL setup. We can easily upgrade Apache, MySQL, PHP and their associated modules on both. In other words, total control, for better or worse.
As to more advanced configurations, we currently use RAID hardware on one box, software on the other. They both have 16GB RAM and 1.5TB of storage. One has twin Intel Xeon E5520 processors, the other an AMD Phenom X6 Hexa Core.
I grant that the CPUs and RAM are probably more powerful than we need, and they might be accommodated by the traditional desktop CPUs from AMD or Intel. The RAM limits are never approached.
I'm attracted to your setups because of low cost and the lack of bandwidth limitations. If you can provide a high-performance configuration with RAID and system configuration flexibility, I'm going to be very, very interested in the possibilities.