The 8xx series are considered small office ISR's. The have most if not all of the features that you will get with a higher end device, just with less resources(obviously).
I used the 871 at my parents house for a long time, multiple VLAN's(routing on a stick), IPsec, QoS without a problem. There is a limitation with this line though, with the 87x series you are limited to 4 VLANs, and with the 85x you are limited to only 1 vlan.
Thank you for the responses. I think I will go with the 871w for the extra VLANs and extra little things.
This router, other than actually being used in a nice little satellite internet network in Afghanistan, will be a part of my study lab along with a 2512, 2610, and a 1912 switch. More switches will be added later as this will be a shared lab.