Benefit 5400 vs 5300 with Citrix

I have budget for buying 15 Citrix servers.

I have been offered      

Proliant DL360R05 X/E5345-2 4GB (2 x QC 2.33 Ghz 1333 FSB (2 x 4MB cache) with 4 x 1 GB memory and SA P400 -256-BBWC and RPS, 2 x SAS 72GB 10K disks, which is a pre-configured bundle

I can let them assemble

Proliant DL360R05  E/5420-2 4GB (2 x QC 2.50 Ghz 1333 FSB (2 x 6MB cache) with 4 x 1 GB memory and SA P400i-256-BBWC and RPS, 2 x SAS 72 GB 10K disks, for about the same parts prise. This machine has to be assembled so that's going to cost me Euro's.

The servers will have Citrix PS 4.5 / Windows 2003 Standard 32bit. Each Citrix servers wil host about 25-30 heavy users and support passthrough for heavy applications.

Beside the slide Ghz difference in both proccessors, which configuration will be the best for my situation?

Does the Intel 5400 series have major benefits for me over the Intel 5300 series?

Shoud I consider buying higher CPU speed at the cost of the number of servers (buying 13 servers high PCU servers instead of 15) or vice versa?

Thanks,

Roland