Hardware Recomendation About New Intel Core 2 Quad 8MB Cache

Hi Guys,
Per the Hardware Recommendations from Jon Hood:
"- For medium call center (upto 75 seats):
asterisk server: single-core opteron (since all transcoding and calls still go through one core in asterisk, it doesn't make sense to buy a multi-core or hyperthreaded system that will only slow you down)
mysql/astguiclient/apache server: hyperthreaded xeon (since astguiclient relies on a number of scripts being executed in parallel, it's good to have hyperthreaded or dual core systems with astguiclient). Remember to nfs-mount the sound recordings directories! "
I'm planning to get my first real hardware server for Vicidial Installation, possibly will also install VTiger CRM . This is what I'm planning to get :
Intel Core 2 Quad Q6600 / 8MB Cache / 2GB DDR2-667 / (3) WD 250GB SATA-II RAID Edition HDDs / RAID 5
How many seats do you think this server will be able to handle, first with 2GB RAM then with 4GB ?
Per the Hardware Recommendations from Jon Hood:
"- For medium call center (upto 75 seats):
asterisk server: single-core opteron (since all transcoding and calls still go through one core in asterisk, it doesn't make sense to buy a multi-core or hyperthreaded system that will only slow you down)
mysql/astguiclient/apache server: hyperthreaded xeon (since astguiclient relies on a number of scripts being executed in parallel, it's good to have hyperthreaded or dual core systems with astguiclient). Remember to nfs-mount the sound recordings directories! "
I'm planning to get my first real hardware server for Vicidial Installation, possibly will also install VTiger CRM . This is what I'm planning to get :
Intel Core 2 Quad Q6600 / 8MB Cache / 2GB DDR2-667 / (3) WD 250GB SATA-II RAID Edition HDDs / RAID 5
How many seats do you think this server will be able to handle, first with 2GB RAM then with 4GB ?