It's a simple move, "zip" up the website directory, export the MySQL Database, copy them over to the new server, and unzip and import the files, turn it on, and you wouldn't even know. Nothing is going to change.
Old:
Intel P4 HT 2.0GHz
2GB RAM (maxed on the crappy server board)
2x37GB WD SATAII 15,000RPM in LVM (stripe config) (it's screwed, I think a drive is dying which is why it gets so freaking slow at certain times during the day)
New:
2x AMD Opteron 2.00GHz (4 core total)
8GB RAM (I found one more 2GB stick, need to find the other, will bring it to 12GB)
2x37GB WD SATAII 15,000RPM in hardware RAID1 (mirror).
Old OS: CentOS 5.4 64bit
New OS: CentOS 5.5 64bit
Both are in identical 1U servers. I have 1x Quad Core Opteron (2.2ghz) and I need to find the other one, which is probably with the missing RAM chip...
Then I could have it at 12GB of RAM and 8 cores.