Any reason you need to purchase software..... This must mean that you have
already used all the 'freeware' that is offered at the EBI web site.... If not,
I would suggest you look at it:
http://www.embl-ebi.ac.uk/biocat/biocat.html,
And that is not the only site.... but is a good start....
It just depends on what your needs are....
I hope this helps (besides saving a whole lot of money!!!!)
harold berninghausen