Looks like I have found the answer for anyone else that is looking.
The 2600XM series supports the above listed features. 2600 series does not. The only differences between the XM and non-XM is the ability to use SDM, more memory, and better processing power. The 2610XM has one fastEthernet interface, 2611XM has two. 2621XM also has two and is more powerful than the lower versions. Thanks.