Redundant VPN ipsec tunnel using 2 dsl connections and a 1841 router?

hi there,

some quick questions. I have a 1841 router and a vpn connection build
to another 1841 router. We have 2 networks on each site, each on his
own subnet.

Now this all works fine with 3 ports on the router. 1 for internet, and
2 for the internal netwerk we like to keep seperated. (not a dmz).

Now we are thinking of adding 2 extra dsl connections on both sites, so
we can have a little redundancy.

1. Is it possible to plugin both dsl connections and create a automatic
fail-over using these connections for the vpn tunnels?

2. Is it possible to do bandwidth management using the cisco 1841
router for 1 of my internal networks? In other works, can i make sure
subnet A will be higher prioritized then subnet B?

3. Can i do stuff like, prioritize rdp and smtp traffic?

I'm familiar with the pix family, and the standard dsl routers... But
this 1841 is a whole new thing for me and i'm just in the dark here
with its possibilities... Any help would be greatly appreciated thnx
a lot.