Well he said his girlfriend wants to buy NIB, ruling out both.
Re: E2 vs standard grips, I'd say that if she likes the feel of the standard grips and has no issues manipulating the trigger in DA then there's no reason to do the E2 unless you're afraid of grip screws coming loose. Though I'll echo what somebody else mentioned above: check out the Hogue Extreme series grips in G10 or aluminum, they're a bit slimmer than the stock (non E2) grips and have better texture. Plus they look cool. With my most recent SIG (2013 mfg 226) it took about two weeks of shooting before I found that I just did not like the E2 grips at all (though they still "feel great in the hand"). If you can definitely have her try both though.