Before you go out and buy a sprayer, ask yourself: is this job the only paint job that I'll need a sprayer for the next 5 years? If the answer is yes, consider renting a sprayer for 1 job only. It will be cheaper in many ways.

A paint sprayer, unlike many other machines or tools, is high maintenance, it requires special cleaning and handling, and if not used and cleaned on a regular basis refuses to work when you finally need it.