I believe that IOS 12.4.25c is the latest version for the 7200VXR series. It's stable, been running it for quite some time. Depending on what you will be doing with this router, will depend on what feature set you'll want. I typically use the Service Provider IOS with IPSEC, 3DES and Lawful Intercept.
We plan on doing BGP on the WAN side and BGP or OSPF on the LAN side. I'm assuming that I will need to upgrade the RAM on this router.
Would
The 15.0 series is available for the 7200VXR. However, unless I'm missing something, note that the Service Provider version doesn't have OSPFv3 for IPv6. You have to go with the Advanced IP series for that. Ray -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.