Hookup 2 internet providers

I am having problems with my ISP (Cable Internet) at home. Every time we have storms, I lose connection to the internet for up to 2 days sometime. This is a MAJOR ISSUE as I work for home & depend upon E-Mail & downloading IOS files & more for work.

I want to also get a DSL connection from AT&T so I will have a Different connections type, route etc so I will hopefully stay up on at least 1 connection when it storms.

I know I can hookup multiple connections on Higher-End CISCO routers with T-1's, DS-3's and such. I am looking for suggestions on how you would reccommend doing this on a home network with a DSL MODEM and a CABLE ROUTER. I didnt know if there was a 3rd party device I could use to aggregate these connections into 1 network;

CABLE MODEM - 192.168.1.1 ------------>
DSL MODEM - 192.168.2.1----------------> 3rd Party Device ------------- 192.168.3.1----------> Home Network

That is my general Idea & Concept. Now how do I do it & what do I need.