Dual WAN / load balancing

Hello

I'm thinking or even better, dreaming of some more power for my internet connection. So I'm dreaming of a dual DSL setup. I searched the internet and found a Nexland router. But this baby is rather expensive (almost 400$).
<A HREF="http://nexland2.temp.veriohosting.com/products/product.cfm?id=4 " target="_new">http://nexland2.temp.veriohosting.com/products/product.cfm?id=4 </A>
I already have one DSL line which is shared over my home network by use of a sever PC (P II / with winroute). My other computers are connected to this server by a switch. Knowing that the nexland router would really blow my budget, what would be the best(=cheapest) sollution. Please help me out with this one.

regards