Upgrading a Cisco 4000

Okay. I hope this is an appropriate subject for this group. I just recently bought a cisco 4000 to get some hands-on. What would you recommend to get this box up to a decent IOS version? What is the best source for ram/flash/ios upgrades? I realize I could research this myself, but if ten of

Upgrading a Cisco 4000

Okay. I hope this is an appropriate subject for this group. I just recently bought a cisco 4000 to get some hands-on. What would you recommend to get this box up to a decent IOS version? What is the best source for ram/flash/ios upgrades? I realize I could research this myself, but if ten of