some advice on buying a new circular saw please

hello guys,
ive been using a bosch pks 40 circular saw, and, well, i really cant say it's a satisfying tool. so im going to buy a new circular saw in a few days.
i currently have these ones in mind, they are all from bosch:
gks 65
gks 55
gks 190
i realize that 190 is only an entry level circular saw but i really dont know how much better the gks 65 and 55 are. are they really worth that extra money? or should i go with the gks 190
also, what is the difference between gks 65 and 55? the...

Source: http://www.woodworkforums.com/f11/some-advice-buying-new-circular-saw-please-159770/

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