Moving from Cable Dbox2 to Sat Dreambox, hopefully in time for Xmas

Been googling the past few days and finally found what receiver (DM800HD Clone) I want -:

DM800 FTA Satellite Receiver HDTv Chinese Version [DM800] - ?220.00 : Linuxsat!, Factory Direct

But I'm not too sure about going for a motorised set-up or a dual/tri LNB

I am aiming to buy another receiver box at a later date (DM500HD) and looking to CS for Sly & watching JCS Sports
for the SPL

Any advice on what size of dish and can you go motorised AND have 2 LNB's?