So your problem with the Xs is pretty much battery related? These SAVs are very demanding when it comes to starting juice.
With the grin still on your face after picking up your iS, I don't think you're ready to throw in the towel yet.
GL.

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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)