For a game server you could get much better bang for your bandwidth buck by co-locating or renting a box. It also means your bandwidth needs are much lower. If all the players connecting to your server are on your LAN then the issue is moot.
You can always get two seperate internet connections (cable and/or DSL), run them off a router that supports two seperate connections and load balances them (like some Nexland routers).
Decent idea but I wouldn't use Nexland to do it. I had 2 Symantec 200r boxes. They are upgraded versions of the Nexland router you're thinking of. They came into Addragyn Labs and went right to eBay. Neither went into use. They are not speed demons.
Throughput chart -
Article The Pro800 does not do load balancing. It does fail over and can combine both connections for downloading *if* you use their downloading client.
A Cisco 2600 series(you'd need to check on exact model) or a Linux box would do beautifully. Here's a
Linux tutorial and I recall hearing that Smoothwall does dual WAN.
The
Speakeasy DSL recommendation I agree with. They are a quality company all around. Excellent customer service and great network reliability and performance. Low latency, great for gamers. I've bought a few lines from them and am very satisfied with everything. I'm more than satisfied, I'm impressed.
I think a quality DSL and a hosted server will give you better value over a T1 and a server running on it.