I'm thinking about purchasing a GX (also considering the LS 430 if my dad doesn't hand down his 2000 Silverado). This is my 2nd option. Just wanted to know what the big differences are between the 04 and 05? I know the engine got a bit more powerful in 2005 but is there anything else from those of you that already have them (Ride comfort, audio/nav upgrades, gas mileage, etc)? I put about 20k miles/year on my cars and it will be an everyday vehicle.