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Charun
Belkin does not have DD WRT support, mate

Also, IMO the three that you mentioned would not be having it either.
I suggested you to get a 2nd hand router so that you could get it cheap @650, try out DD WRT and then see if the script for autologin works. Its surely better to do this rather than getting a 3K router and then finding out that the script does not work, etc.
Once the item works, just resell the router for the same price or 100 less to the other person who wants it

Buy the ASUS RT N13. Then use the same script on it
I dunno about yours, but in my case, I keep the torrents on all the time. When I start to surf the net, usually the speed of the torrents reduces. So it should be the same for you.
---------- Post added at 08:51 AM ---------- Previous post was at 08:47 AM ----------
As for DD WRT, its an kinda like a new OS for your router with more features than the original one that came with the router. DD WRT is much more powerful than the stock firmware that comes on your router. Also, installing DD WRT voids the warranty , so if there is an issue with the router then, you would need to reflash the stock firmware.