Hi Darryl,
In regards to the clear/glass or the UV/IR filter, if you are planning to do IR daytime shot, then the clear glasss is the way to go otherwise if not, then i probably go with the UV/IR one so you don't have to buy an additional front UV/IR filter later on down the track.
You'll find some relevant info here between the two as well as front filters.
http://www.sciencecenter.net/hutech/canon/index.htm
cheers.