I've recently been using plate-holders to hold my systems. Some people live and die by them and say theyre great because they hold the systems upright and make them look all fancy. Only problem is they're pretty flimsy and cant hold bigger systems. Well, I just found a game changer a few days ago.
http://www.amazon.com/gp/product/B00GVA3BS6/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1That silicone phone stand fixes all of the problems. It holds every handheld I own easily (GBC, GBA, GBASP, Fat NDS, 3DS, PSP1000, even a GAME GEAR!) and with it being all black it looks very nice. The silicon is very soft and light on the systems and makes it extremely easy to put the systems in and not worry because they wont slip. I only bought one to test it out but now I will definitely be buying some for each system I own. The only real downside is that it is a little bit bulky if you're trying to fit your handhelds in a tight space but the handhelds standing up on their own take up a lot of space as well so I don't see that as a problem. I will be taking pictures of each system I have in it and uploading them in an edit to this post if you guys want to see what all those systems in there look like.
Hopefully me sharing this helps someone with displaying their portable systems
I AM IN NO WAY AFFILIATED WITH THE MAKING OF THESE! Just bought one and thought you all might like to look into it yourselves.