the Costa Blanca is really gorgeous, the beaches are unbelievable :)
there are lots of English people in Alicante but as far as I remember there is a real mix of tourists in Murcia and it is more "Spanish"!
I booked my accomodation with
http://www.holistay.com/spain/ as the value for money was good but you can normally find good deals on the usual expedia or lastminute websites.