I've always found Kosmar really good for holidays in Greece - I've used them about 6/7 times and never had any problems with them. They have quite good prices as well. I also loved Kefalonia. Can't do links, but they're at www.kosmar.co.uk
IKWYM Beetroot, I'm not impressed with the rest of Rhodes but Lindos is beautiful, although perhaps not overwhelmingly Greek either. My parents have been too and my Mum said that Lindo reminded her of places they visited in Italy.