I always preferred SE over nokia but never tried it for the simple reason that Im very comfortable with pc suite. Recently I come across to a post on http://gizmodo.com/gadgets/cellphones/zyb-backs-up-your-contacts-online-193493.php that made my life quite simpler.
http://www.zyb.com gives free online phone backup to more than 200 phones including K750i and K800i. I was thinking of K750i but after reading your post i believe i’ll go for a K800i.