Ah, ah, life's conundrum yet again. I've definitely "justified" spending $$ on all kinds of bike parts/pieces to save a few grams here and there. Sometimes even fairly substantial amounts.
No doubt I'd not spend $$ on wheels that weigh more than my current wheels do, even if the bling factor was huge. so, the weight savings along with some amount of new/bling/cool factor generally tips the scale in the "buy'em now, don't wait" direction for me.
If you've got the dough, buy'em now, don't wait!