You can buy a great machine right now because the market is so bad, use it for 90 days or however long the job requires and then sell it. Odds are the market will be much better in a few months than it is now.
There are a lot of good machines out there that are available on the cheap. We will even help you sell it when you are done and charge only 10%. You could literally use it for free or close to it. We have repos that banks are wanting to cut loose and the prices are very good right now.
http://www.ironmart.com/equipment_detail.php?equipID=79
http://www.ironmart.com/equipment_detail.php?equipID=84
Some dealers will also rent to you for a stated period of time and that can be a good way to go. I have another HydroAx 511Ex that is available which is real nice and in the $40-50 range. It is very nice and has been well cared for. I don't have it listed yet but its a good machine and its actually hard to find machines in that range. Most are either rough or real nice.
Good Luck,
Jesse