Lots of choices and reasonable prices! I'm a gadget freak--can't help myself, if it looks handy, I buy it
I'd also like a more visible newsletter sign up so I can opt out of them. If you have good products and reasonable prices I don't have to be inundated with a gadrillion emails and newsletters because I will most certainly come back. Also, shipping is a biggie. I've had a site charge me for priority shipping but didn't ship for 4 days!