4.8iS would be equipped with all the options (except rear side air bags and rear loading floor, which mine had) Unless your 4.4i has all the available options, the 4.8iS would be much better equipped.
If you were closer or ever come to Atlanta area, I'll let you drive and hear my DINAN 4.8iS and you can decide

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00 E39 DINAN S1 //M5 (82k miles)
06 E53 DINAN 4.8iS, born 2/18/2006 (126k miles) http://www.xoutpost.com/bmw-sav-foru...s-my-dslr.html
90 Straman Z32 TwinTurbo Convertible, (1 of 44 ever made) 5 speed, 444rwhp/451rwtq
01 360 Novitec Spider F1 (26k miles)