Ralph Lauren seems to have some nice polo suits that fit me very nicely OTR, but they also have 4"+ lapels or so, looks a bit 70s to me. I'm a fan of wide peak lapels, but not really sure if this look will look...dated?
I'd rather have too wide than too narrow -- but either extreme pushes ridiculousness. I like my lapels slightly wide. I wear a 36 R, though, so 3.5"-3.75" is the sweet spot for me. The only jackets I see that wear really wide lapels well also have really high gorges -- which has a dramatic effect on how wide the lapel appears.
I have like 5" lapels on an overcoat, and that's awesome.
+1 The large lapels make me think of old man clothes.