SFP or X2?

I just recently started using cisco X2 ports. Generally cisco uses standard SFP or SFP+ ports across their cisco product lines. I believe Cisco started the 10Gig adoption with the X2 ports before the development of SFP+. Cisco has all but removed the X2 from their product lines but many X2 3560e switches are going to be around for awhile. This being said if you want go 10Gig, I highly suggest pruchasing Cisco CVR-X2-SFP10G with the standard SFP+. This solutions gives you the flexibility to use those SFP+ on the next generation switches. Make sure you check the Compatibility Matrix and IOS version as you mostly likely need an IOS update.

Cisco CVR-X2-SFP10G