This is the same as the Odyssey 400, except it comes with an extra game and color graphics.

It's pretty cherry, I just bought it.  I had a 500 at one point in the past and sold it because I thought I had a dupe.  (Which was actually a 3000)  So I just picked up this one which completed my Odyssey collection.

I don't know what Smash is.  Some variant of pong.

  Pretty much anything that is complete and in the box is really rare.  They go for a lot of money when they get listed on Ebay.  Stuff from the 70's and 80's almost never comes in the box.  I don't even remember what a Sega Genesis box looks like.  You almost never see one on Ebay.

Well if it's a CORE system or the Genesis 3 you won't get much for it right now.  The Genesis was really popular.  It also hasn't hit the point yet where it has started to appreciate in value.  Consoles tend to go for less than what you paid for them until they reach a certain age and then that price can rise, depending on the condition.

Having accessories really helps.  For instance the Master System expansion with the 3D glasses is bigger money than just the Genesis itself.

I'd sit on it for as long as possible.  In another ten years it'll be worth significantly more than it is today.  But no system is worth tons of money.  The holy grail is The Adventurevision.  A mint, unopened, system with all the games unopened and sealed would fetch between 5,000 to 10,000 dollars max.  Most every other system is well below $1000.  But every year their value increases.