Hi ColdSun!
I still use a very old Simpad (by Siemens) to read, so far for more than 150 books...
My favorite readers are
uBook (MicroBook) Reader
and
Mobipocket...
Don't know if your device can be synched with the Mobi Desktop Software, but it's not necesarry:
Just drag and drop...
If you want to take Annotations and Bookmarks to another Device, you just have to copy not only the *.prc file, but the *.mbp file of the same name; works perfect for me: Just don't forget to close the book before copying (meaning go to the library-mode of Mobi-Reader), or you will not get the latest Annotations...
Hope you will be able to enjoy your new reader soon!