Hi Lori,
Projectors are not for the weak of heart! You are about to embark on an arduous journey... :)
Generally speaking, you can rent them for around $100/day, or buy a new one for somewhere between $600 and $2500.
There are two problems with owning them:
1. Anything at a "reasonable" price (say, less than $1000) is going to be pretty weak, with poor color, and almost requires a completely dark room.
2. The replacement cost for bulbs. They don't last as long as you expect them to, and they are extraordinarily expensive. Some of them run hundreds of dollars!
As a starting point you can look for the number of "lumens" the projector is rated for. The "right" number of lumens is a subjective thing, but really anything less than 3000 is going to dictate too many restrictions for it to be a general use solution. (Limitations include: The size of the room, amount of ambient light, color quality, etc.)
Of course, the brighter and more precise the detail (and colors), the more expensive the replacement bulbs are.
So it is like a three axis teeter-totter that only you can balance: Cost vs Flexibility vs Image Quality. Decide which two are most important to you, and then Google "LCD projector rental Seattle" and you will see where to try them out.
Best of luck with it! I've been looking for my personal balance point for years, and still haven't purchased one.