The most popular VHF/UHF bands are 2 meters and 70 cm.. As royldean points out, there are generally more 2 meter repeaters. But, there are many dual band radios on the market, so you don't need to be constrained to one band.
What radio? That can't be answered without knowing your budget. Is it over or under $1000. Do you want a handheld, a mobile or something for your desk? Are you interested in only FM, or do you want digital modes? Does single sideband interest you?
You can go from a $30 Chinese Baofeng, Puxing Poo-flung etc up to a desktop radio like the Icom IC-9100 for about $2,500 or the Kenwood TS-2000 for $1,400. (The latter two have HF capability, which is something you can use as you move up in license class).
Radios also need antennas. Do you want the rubber duck that comes with a handheld, a decent mobile antenna for your car or a high gain vertical antenna on top of a 50 foot tower?