If you want to get the right Xenarc from somewhere cheaper (eg the mp3car shop) then jsut make sure it has the right button colour as they changed the button colour on the newer models with improved brightness. The Xenarc also have anti-glare which can help. There are some Xenarc/lilliput comparisons in the LinITX review.
And befroe you ask i can't remember what colour the buttons are on the new model but i read it somewhere here.
hope this helps