You're right, I think there is a definite need for a hardware dork to write a blog exclusively about Big-Ass Servers™ in bioinformatics. I imagine IBM and Dell would happily keep it plastered with ads.
With regard to storage, we have been using a NAS sold by Isilon. Although I have recently experienced some odd quirks with this system, it is scalable to 15 petabytes - enough to keep you going until next year.
The BAS post is not just about processing time and benefits of shared memory, but also human time, which is far more expensive. Since I wrote that post we have had more and more issues with our cluster (endless image updates, ABI's new software doesn't work on it) and more good experiences (RStudio Server, gnu parallel) with our BAS that only confirm my convictions. For a small bioinformatics core, clusters look cheaper on paper, but in reality they are cheaper only if your time is worthless.