1) The Wii. My very first home console, and still tons of fun to play. Nowadays I may rarely play on it, with the Wii U, my new gaming laptop, and even a bit of 3DS kind of taking over, but the infinite amount of fun I had with the Wii puts it at my absolute number one.
2) The DS. My very first handheld console. I know this may seem very biased, but I do think DS is the most fun to collect for. Keep in mind, I only collect for a few consoles (DS, Wii, and preparing for 3DS and Wii U), but for some reason I just really like collecting DS games the most. Maybe it's the huge variety of games that came out for it, or just my nostalgia towards those cheap 3rd party DS-quality 3D models, but DS games have a charm I can't deny, and I love collecting them.