I have to disagree with Pierre on the usability of Amigas... if it does what you need (including Internet related work and day to day operations) more power to you.
I myself merely play older games on my Miggie, but I have a Mac Mini for my regular work, but I do require some horse power and an ability to run modern software like PHP, MySQL and the like -- things that won't work from an Amiga. But if all I needed was Internet e-mail, IRC, Word Processing, etc... a Miggie would be just fine. This is of course my own opinion.
Welcome to A.org and good luck finding your machine!
Have a great time in our community!
Mike