Recommendations for used enterprise Cisco hardware buyers/resellers (UCS blades and switches primarily)?

Greetings,

I'm the junior network admin at a medium sized corporation and I've been tasked with selling about ~10 Cisco UCS blades and various Cisco gigabit+ switches. I've found a few companies that specialize in buying and reselling enterprise hardware via Google (P3Online looks like a pretty reputable one), but I'm wondering if any of you have had good success with specific companies and/or have recommendations? Thanks!