Advice to choose new Dedicated Server
 

Hello, I am cheking the new offerts of my dedicated server hosting, they are very interesting and I would like have your suggestion and advice to choose the best dedicated for an upgrade next months.
On my server I have a vBulletin Community, vB 4 + vBSEO + Xcache, with 40.000 members and about 10.000 unique visitators daily, vBulletin database Mysql of 500Mb, 2 Wordpress Blog and 1 Html website.
I use Apache as server, php and Mysql.

Actually I have a:

Dual Xeon 2.8GHZ Hyperthreaded Special
Memory: 8GB DDR Registered/ECC
2 HD x 250GB - 7200 RPM

New offerts are:

Professional AMD 8 core 6128
Memory: 4G DDR2 SDRAM
HD1 & HD2: 250GB 7200RPM SATA / 8MB Cache

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Dual Xeon E5520 Quad Core Gainstown
4GB DDR3 SDRAM
2 HD x 250 GB - 7200 RPM

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AMD Phenom II X6-1055T HEXA Core Featuring Up to 3.3GHZ TurboCore technology!
8GB DDR SDRAM
2 x 250GB SATA RAID 1

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All the servers has a price between 200 / 300 $.

What is the processor more speed?
Do you advice me to choose also a new HD with more speed, 10.000RPM?
What need change for has a really increase at speed and performance? Processor, RAM, HD?
Thank you