But even though Juniper has a nice OOBE, we discovered performance is crap under high load compared to some others.
There are probably simpler ways to do what you want to do - some
routers I've been playing with lately will let you assign any port(s) in any way you like (I think the new
Ubiquiti EdgeMax devices can do it, they're based on Vyatta) and some of the (what used to be)
Linksys VPN routers have up to so many WAN ports - I had a 16 port device in my house and I can use up to 8 of them for WAN, software configuration is pretty easy although the UI is crap - but that device has just been retired in favour of a
Mikrotik routerboard which I just upgraded to RouterOS 6.2 today.