Welcome to the forum. Right now, Voom has more HD content than any other provider. If you want that type of viewing, then get Voom. You might as well try it out and see for yourself. There are good deals on installation with no up-front costs, so there's not much to lose. There is no long-term commitment, and no contract, so I'd say sign up, get it, and let us know how you like it.
The people who frequent the Voom General Forum will help you overcome most obstacles, and SOMEBODY will know the answer to almost any question. You can get answers here instead of calling a CSR.