I'm not sure if this works for you but I use Sun VirtualBox with a WindowsXP running inside.
The nice thing about SONY is they have gone with ePUB so you don't have to buy exclusively from them.
Also since most Publishers have pushed for the "Agency" price model most vendors will be selling books at the same price.
All you have to do is Register Adobe DE and you will be able to buy eBooks form other vendors like BooksonBoard.com Kobo.com and Fictionwise.com
The only trick is you might have to do a one time registration with ADE in windows.
Personally I have stuck with MOBI since the DRM is not tied to an OS/browser.
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