The 32" A650 isn't really any better than the A550 unless you want a glossy (instead of semi-matte) panel. The 32/37" versions of the A650 are not 120Hz panels, which is the primary reason for moving up to the A650 series.
First off, a 37 inch 650 series screen doesnt exist. Second, ALL 650's are 120hz and the 550 is glossy just like the 650. It's the 530 and 630 models which are matte.