It depends on how many loads you have as to what will fit your budget. UPB is a Powerline (PLC) technology that uses your house wiring, like X10 and Insteon. The signals that control things go over your house wiring. Hardwired switches use a separate dedicated control wire for its control signalling, taking them off the powerline which increases reliability.
Personally, with that budget, I would probably do a hybrid system where I use hardwire for mission critical lighting that may be used for security and other very important functions, then use UPB for the rest, like outlets and maybe things like closets, etc. But you have to look at the costs, I don't know the average cost per switch/device for the hardwire but UPB will run about $80-$90 per device at retail (for a new SAI US240). Of course there are some less expensive models and you can get quantity pricing. At that budget, you can probably get 35-55 UPB devices depending on the model and discount.