You can download an evaluation version of Paint Shop Pro 9 so you can get used to working with transparency. I think the period is 30 days but it's the only graphics editor I use.
www.jasc.comI have PhotoshopCS 8 and Illustrator, niether comes close for ease of use and features for the money. Paint Shop is $129.00 if you want to keep it.
Luckily the company I work for sprung for the Adobe software.
Noel