I also use Adobe Pro and love it! It comes in handy when creating contracts (can do with fillable areas or customize for specific clients) and numerous other documents - Excel, Word, website captures, scanned documents, etc., etc. I also use it to create nice looking fillable forms, such as a credit card info form (I encrypt [and also password protect] the pdf), web design questionnaire, new client questionnaire, forms that calculate for invoicing or other documents, and...the list could go on and on.
It is an awesome program. I use
Software Surplus a lot for purchasing software. For the FULL version (NOT upgrade) of Adobe Pro (Windows) version 9 it is $139.00 (Mac is $20 more). You might find other online stores that sell v9 for less (vX [v10] is available for preorder, but is darn expensive!). I have a history with Software Surplus, so I use them - they are less expensive than Amazon for full version 9.