I LOVE my asm G2 skimmer I have a 95 gal tank with a 25 gal sump and if I had to do anything dinnerently I would have gone with the G3 but even that extra 4 inches wouldnt fit or I would have gone that route...
If you have the room go with the G3 for the extra 50 bux its well worth it.
You can buy it from askskimmer.com for 220.00USD I think or oceansaquatic has then in stock. 1 good thing about askskimmer.com is you can buy then with the re circ mod or the gate valve mod already done for a nominal fee.
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magic flight