Suggest packages to use on my VPS

[scars230]

Hi
I have the following resources in my VPS :-

CPU Cores : 1
Guranteed Memory : 256 MB
Burst Memory : 512
Bandwith : 1000 gb
OpenVZ Virtualization

Now I am a little confused on choosing the correct softwares.
My Needs are the following :-

1. Only one domain needs to be hosted on this vps
2. There should be normal things like forums, support tickets, etc.
3. E-Mail Server
4. A few miscellaneous things.
5. FTP Server
6. The web site / Domain would have approximately 500 registered users only.

I am to decide on the packages i have to use such as web server, and everything else so that i don't cross the resource limits of my vps.

Please Advice