Re: I have a bridge to sell you....
Jay from VCE here... oh hai!
Actually, with a Vblock you can use any of VCE's management & orchestration from partners: BMC CLM, CA PCA, etc. etc. as well as the stacks from EMC, Cisco, and VMware i.e. ITO, CIAC, vCD, etc. etc.
source: http://www.vce.com/solutions/management-orchestration.htm
Also, you can't just "run any tech combo you want" because a Vblock is a product that was pre-engineered, pre-validated, and pre-tested both physically and logically.
source: http://www.vce.com/vblock/
Lastly, the "application level integration" and "advantages" when using a Vblock are why customers choose Vblock in the first place.
source: http://www.vce.com/solutions/