wow thanks yard and yeoldstone for your help

... about my game
http://www.Lineage2.com the server im hosting is a MMORPG..well ill probably have a good 200+ people and itll eventually grow aswell to about i want to say 600-800people..now some other private servers ive seen they had a rig like so
Server Memory 8192MB RAM (8GBs)
Primary Storage (Dedicated Files For Server Related Files): 1 x 73GB U320 SCI Hard Drive (RAID5)
Secondary Storage (Dedicated Files For L2): 1 x 73GB U320 SCI Hard Drive (RAID5)
Tertiary Storage (Dedicated Files For MySql and Data Base Info): 1 x 73GB U320 SCI Hard Drive (RAID5)
Operating System: CentOS 4.x
Control Panel Software Cpanel /WHM
IP Addresses 5 Bandwidth Unmetered
Dual Opteron CPUs
8 Gigs of RAM
Dual SCSI Raid-0 32Gig 10KRPM
100Mbit Backbone
and
Dual Xeons 3.2Ghz
8 Gigs of RAM
Dual 32Gig 10k RPM HDs
100Mbit Connection
and
Dual Xeons 3.4Ghz
8 Gigs of RAM
Dual 32Gig 15k RPM HDs
100Mbit Connection
these are the systems ive seen...reason i tried to get something like so...but reason im asking on here is because everytime ive asked for help you guys were always right and if i dont need to be going all out with rigs like those to host a MMORPG game like mine..then i wont waste the money all the extra stuff i dont need and wont be using...im mainly worried about being DDOS'd any possible way i can stay away from DDOS'ers....once again thank you both very much for your help i really do appreciate it
*also here are the system req. to play the game...these are not to host it just to play it off of a server...
Minimum Requirements
CPU: Pentium 3 800MHz or better
RAM: Higher than 256M
Graphics Card: GeForce2 or better
Connection: 56K Internet Connection
Recommended Specifications
CPU: Pentium 4 2GHz or better
RAM: Higher than 512M
Graphics Card: GeForceFX 5600 or better
Connection: Broadband Internet Connection