i dare not consider myself as a pro here as i just started my G-collections, but i would be glad to share with you my 2 cents =)

if u like simplicity (like me  ), i would recommend GAC100 & GAC110 series. Both are pure analog chronograph, make them only possess stopwatch function.

some 'racun' from me, they are my 1st and 2nd G-Shock 

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if u would like to assess more functionality, i would suggest GA110 series as they are more mainstream and widely accepted by public (as per my observation).

http://1.bp.blogspot.com/-BvevPzMKS5g/UzrL...0+SERIES+V1.jpg

Each of them would cost around 400++ for normal edition but definitely under 500.

Hope it helps, have a nice evening!!