I am a huge fan of Wii Play Games.  The staff has always been super friendly and helpful, the selection is really amazing, the website is always up to date so you know you won't be wasting gas to go there and then them not have what you're looking for.  It's a bit far off the strip if you're just visiting town, but definitely worth the trip. They have everything from Atari games and consoles to Virtual Boy to PS4 and even custom games created by fans.  The prices are mostly fair and I have never walked out thinking I spent too much money on something.  The amount of collectibles and toys they have is amazing as well.  Huge selection with something for fans of pretty much anything.  The store is kind of big, so definitely set aside a good hour or so to peruse the store and be sure to chat with Dave.