I have the Dynalink, it's a pretty good value. Check the full thread, there are a lot of benchmarks in there. It's a big thread, but you can search it. The install is pretty easy if you can follow directions, but it's not as simple as uploading a file to the stock firmware.
It can route your 1G connection, but I don't think it can handle SQM at your speeds. Wireless performance is very much dependent on distance, obstructions and other factors. It works great for me, but my high bandwidth users are all wired.
If you have a particularly complicated setup, or run extra services on your router you can post your details to that thread and someone will likely be able to tell you if it'll work.