Consoles: Nintendo 64, GameCube; Sony PlayStation 2 & 3
Handhelds: Game Boy Advance, PlayStation Portable
Nintendo 64
The N64 is only one reason to have a system. Yes, I mean owning the 64 with no games at all. Sure enough, all you'll be doing is staring at that funny system, but it is amazing! Anyway, So many great games appeared on that system, including Super Mario 64, Mario Kart 64, Ocarina of Time, Majora's Mask, Turok Rage Wars...I could go on! Many Nintendo 64 games are far more playable – and bearable – than many of these modern games out there. Better physics, better music, better gameplay. Of course, in my opinion anyway. The N64 is just great, not the perfect system around but far better than many others in my opinion.
GameCube
Smash Bros Melee and Soul Calibur 2; Wind Waker and Twilight Princess; REmake and Resident Evil 4...alike the 64, the GC has brought many great games to the table, which indeed are far more playable than most modern games today. The games were longer than their 64 counterparts, and had more depth (just compare SSBM with SSB64!). Physics were improved, as were graphics. But the thing is, graphics weren't the main part of the GameCube, so the quality persevered! Amazing, no?
PlayStation 2
The PS2 was known as being the turn of the 21st century in gaming. Really, with the FF8 tech demo and what not, who COULDN'T just bawl because of the graphics? That's not all though, the PS2 also delivered some of the best RPGs in history: Final Fantasy X, XII, Star Ocean 3...gosh. If anything, I turn to the PS2 for a great RPG, no other system can compare.
PlayStation 3
Graphics. Graphics. Graphics. The PS3 is lauded for its amazing graphics. Sure, the quality of the games has degraded since the era of PS2GC, but each modern game still has a certain quality to it taht makes me want to keep that game, even if I hate it. Soul Calibur 4, Star Ocean 4, Gran Turismo 5...thye may not be the best of their respective series, but they're still good games.
Game Boy Advance
From allowing me to play my GB/C games and to bringing even more to the table, there's absolutely no reason why I SHOULDN'T be in love with the GBA. Fire Emblem: Sacred Stones, FE7, Zelda Minish Cap, Tekken Advance...I could keep going.
PlayStation Portable
There's only one reason why I'm connected to the PSP. That reason is none other than Kingdom Hearts Birth by Sleep. Best game on the PSP in my opinion.