ok, its been a good while but here y go
The main "attraction" temples are
Angkor Wat - the big boy, and I do mean big. You can spend a whole day just wandering around this complex... I did. If you suffer from vertigo do not climb up the steps...I had to help someone down who didnt know that coming down the steps look almost vertical
Angkor Thom - a smaller temple complex nearby that the archaeologists have left in its raw state so mostly un reconstructed and still with trees and vines growing all over it so you can see how the jungle takes a temple over. They filmed Tomb Raider at this one.
The Bayon - again close ish by - this is the one with all the Buddha faces on the towers. Go towards the end of the afternoon or very very early and you can watch the faces change as the rising or setting sun moves across them.
Banteay Srei (pronounced Bantay Sray). This one is a long way out towards the edge and is relatively small, but is one of the most beautiful with lace like stone carvings. Getting there on a motocy taxi is part of the fun. I got back from that trip red from head to toe from all teh road dust.
Ta Prohm - a bit like the Bayon that again has had some jungle growth on it. Close in so easy to get to.
The best way of getting about is to hire a local motocy bloke on a day basis to buzz you between sites - the main complex alone covers about 60 sq miles....its a city. The only longish haul was to Banteay Srei but its good to get a local as they can also add in some local history (around the KR days).
I got a three day ticket rather than three one day ones. The ticketing may well have changed. Three days is the least a temple head like me find enoungh. One day will not be enough so Id recc a three day ticket. Getting out real early is a good recc, or go in off season as the big tour groups really piss on the atmosphere of the place. staying till later in the afternoon also works - the motocy blokes know eher to get some decent grub.
There are plenty of good guesthouses in town, and they can ususally put you in touch with a motocy man. If you are real picky there are some plush hotels near to the complex itself, but they are expensive and soulless.
Mate my recc is keep it local and stick your money in pockets that need it rather than big hotel and restaurant chains. Use local drivers as they know the best routes and will take you to off the beaten track sites and lesser visited temples. Get talking to them and they can fill you in on local superstitions about the temples (giants must have built them) and the black days of the KR years....
Have a great time bro, and take loads of piccys to post here - jealous I am

"Science flew men to the moon. Religion flew men into buildings."
"To sin by silence makes cowards of men."