So if you are successfully printing now.....Congratulations, it's ultimately going to be easier for you to adapt down the road, and you do not need to buy the upgrade.
(Believe me, that is a benefit beyond price.)

Before you decide that you got caught at a bad time in the switch-over cycle between machines....Wait, read through the revised Beginner's Guide when it comes out, and see if you even think you need it. With the exception of a different method for adjusting the bed level (which doesn't happen more than once every 6 months or so) there are no differences in printing with the machine. You're already ahead of the game by buying early. (And if you don't want to mess with Z-Offsets, just buy the upgrade when it comes available. You'll have spent the same amount as you would if you waited a month and got the higher priced new machine anyway. Usually assembly requires a screwdriver or two and the ability to follow instructions, so no biggie.)