My very first system was the Paradigm Cinema speakers. They are pretty decent for the price and will blow away pretty much all the HTIB systems.
The weak point would be that they really need to be in a small to medium sized room. My living room was just too big for those little speakers to deliver a full sound for HT. I had the PDR-10 sub at the time and paired up with the Cinema speakers It is a solid set up for the money.
As far as ceiling mounting goes..I'm not sure how you would go about doing that. They are prett small but I don't know how you would position them in order for them to sound right etc.