Theres a couple things here:
1) Yes, you can sometimes plug the 'IR' directly into a device, othertimes, you will need to strip the carrier frequency from the 'IR' code before you will have any luck with control. Xantech's part called the 794 OR 797 interface module (the modules are brand specific),is what you will need. Check out
www.xantech.com under products then modules.
2) I would stick with a one brand of gear, lots of these are interchangable, but try to get service when the find out that you've intermixed their 'stuff'. I recommend Xantech, I've never had their gear let me down.
If your not zoning any of your devices, you can get away with a 'blaster' type emmiter...alhtough if you have it in the budget, I'd stick with using the Xantech 791-44 connecting block, it will give you 10 amplified emitter outputs.
If you want to chat more, please feel free to email me.
Matt
(from MN)