Is my server worthy?

I'm installing a second server at a new location and wondered if I could ask your opinion.

The server is a Dell PowerEdge T310.
I'm not running a raid but have three drives installed:
Root (primary drive) 100gb SATA2
2 x 500gb SATA2
8gb DDR3 (planning on upgrading to 16gb)
2.40GHz X3430 4-Cores

and this is connected to fibre optics at 20mb up and 75mb down stream.
The website will be a Wordpress backbone with WooCommerce
There will be an ad campaign through email as well

I plan to run a takeaway ordering website for our local area. I'm expecting about 500+ users to be browsing the site at once with about 100 actually ordering at once.
Can you see any obvious bottlenecks with this setup or recommendations or anything that needs to be planned in relation to hardware or CWP

Proper configuration is everything.  I've made VPS's with 2GB or ram do 500 customers at a time.  Best way would be to set it up, and stress test it before going live.

That's a good point