Choosing disk for website+forum

[van Sinn]

For a non-comercial site+forum, I'd like comments on choosing a single disk for a new install.
The site+forum is currently down, so a URL is pretty much irrelevant.

Brief stats:
The website part is mostly static contents comprising 600+ files for navigation, PDF documentation, pictures and some mp3 soundclips, which are partly downloaded partly being streamed - note that this isn't a music site; the clips are mostly sound demos.
The forum part has about 2000 users, 110000 posts, usually 50-85 members/guests online, peaking at maybe 150.
The former server was a 2.8Ghz single core, 3GB ram, single SATA 1.5 drive, installed as a windows server with a vmware server (the old version) housing an Ubuntu-based LAMP stack, the forum software and various other things. The whole install base plus contents is a mere 5GB.

The new server will likely be a core duo 2Ghz, 4GB ram, with the stack installed directly on hardware, i.e. no virtualisation.
Given that the old server handled it just nice with even less fancy hardware, I clearly won't a high speed SAN   but I'm in flux about using an SSD, and if so which?, or a Seagate Momentus, which could cache virtually the whole site+forum.

Regarding the Momentus, I'm unsure about running it 24/7, as it isn't a dedicated server disk.
Regarding using an SSD, I'm unsure about how it'll handle the volume of especially log writings. Contents added to the MySQL server is likewise of concern. I'm of course thinking of how SSD's deteriorates over time with large amounts of writes.

[LiroyvH]

The momentus should be able to run 24/7 if you have a good airflow in the machine, no problems.
Expect a shorter lifetime cycle in regards to a enterprise disk though, of course. Should still run for years

SSD is indeed massively awesome for mySQL if you have tons of reads/writes queries, SSD is very impressive with speeds, but if I look at the statistics you presented: I doubt you will notice a difference.
I will still host such forums on our shared environment, there is no need for enhanced resources for mySQL in that regard. If you are to grow massively though; SSD is a must at some point.
Modern SSD's don't really deteriorate anymore. Eventually they will die probably, but the same can be said for regular hard drives. In essence, a SSD has the same lifetime in performance and "lifetime " as a 'normal' hard drive.

As for which brand... Samsung has some awesome drives released.
Intel and OCZ (spec. Vertex 3 and Vertex 4 series) both make awesome drives as well for SSD.

Either way though, I think you'll be fine for now with the Momentus. Much cheaper, too...