Do a search for inwalls here, there are several recommendations. Go with an enclosed in-wall speaker.
Budget is really about what you want to spend... the better speakers do tend to cost more. If at all possible listen to all speakers you are considering in an environment as close to your own as possible. You can spend anywhere from a couple hundred per pair - to thousands per speaker. It all depends on your own tastes.
For the inwalls/inceilings the only speakers I've heard in a real room environment have been the Triads, and I like them a lot.
Budget is really about what you want to spend... the better speakers do tend to cost more. If at all possible listen to all speakers you are considering in an environment as close to your own as possible. You can spend anywhere from a couple hundred per pair - to thousands per speaker. It all depends on your own tastes.
For the inwalls/inceilings the only speakers I've heard in a real room environment have been the Triads, and I like them a lot.