[clug] Dual ADSL modem router

[Adrian]

I am looking to purchase a dual ADSL modem and router. I want two ADSL lines so that I can increase my upload capabilities.

Is there a device that combines all this in one box or must I purchase two modems and an appropriate router?

I do have an existing, and working, modem and router, which if the NAT and firewall features were turned off it would function as 
a basic modem, although I have not tried this.

Are there an catches/tricks to doing this?

Adrian