I really don't know what to do

Ipaq has very good screen but slow cpu (203mhz) and is the cheapest of this 3. A600 is 50$ more expensive and has better cpu and metal case. A620 has fast cpu os 2003 and CF slot which i prefer the most,cause i have digital carmera with cf,but it is the most expensive...And has not very good case-i heard....The difrence in price between 1915 and 620 is big for me...Is 1915 enough for dvix and games? ewentually a600-it is faster and not very more expensive , but a600 is very old model and ipaq1915 is quite new....What about a600 work?Works it good with this old os version?I relly have a problem