Hi
What are you using at the moment? I suspect you will find nothing much better than what you already have. You can't pay more for a better modem, they are all much the same, i.e. you will need see anything radical in performance between any of them.
Now... If you are talking about QoS, then what you are probably meaning is you want a better router. 7Mbps on the upload side isn't very fast at all, and I suspect you might be struggling QoS or no QoS. Do you have some line stats from your current modem, why did you get the slower package rather than 80/20, i.e. is this all your line can handle?
Also you could use QoS to prioritise your gaming traffic (if playing online games) to have priority or your video upstream to have priority, but ether way one suffers, but you wouldn't want either one to suffer.
Given the low speeds, then any modem/router combination is going to be able to move that traffic plenty fast enough, your bottleneck is always going to be the connection itself.
Maybe someone else with more tips can jump in.
Regards
Phil