Please help me choose a mountainboard to buy!

[Hpi-guy]

Hi all,
I've been snowboarding ever since I was 7 years old but only recently have I even heard of mountainboarding, as I was looking on amazon at longboards and a MBS mountainboard came up as recommended. Hours later of research and videos and I'm hooked!
So I hope to purchase my first mountainboard soon. Like I said I've been snowboarding for a long time and it looks similar to snowboarding. I'd love to ride all year long and these boards look very capable of doing just that. I really don't know where to begin though, I have a budget of around $350, give or take a little. However I am 14 years old so money does not come easily, so something on the cheaper side would be better. I've been looking at these boards:
MBS Core 94
MBS Core 90
Atom 95x
MBS Colt 90
I want a board that will:
Handle going down runs at places like Keystone, Breckenridge, Winter Park, bike parks, etc (I live in CO)
Won't break in half being jumped, like I'm not gonna jump 20 ft in the air but I do want to jump and grind at parks and such.
Perhaps something light enough that I can cruise around town with friends that longboard?
Something upgradable and I won't outgrow soon. I dunno what kind of upgrades to get but I don't want to get a cheap board and have to buy a more expensive one soon if that makes sense.

I am 5'11" and weigh 145 pounds. Are these boards a good fit for me? What should I look for when buying one? What are things I should upgrade?
Any help would be greatly appreciated!

[mario64]

I think the best board you can get would be a trampa, they never break but they're a bit pricey. i found one here on ebay that's just in your budget. the mbs boards that you mentioned are good for starting out, but as you have allot of snowboarding experience you might outgrow them quickly. It's up to you though.
As for upgrades, the first one i'd recommend is heal straps for the bindings.

[Ben]

have you seen this: http://www.mbs.com/board-chooser/
id say at your size(and your still growing probably) you should not be going for the core range and DEFINITELY not the atom. comp are good for you now and it future, and will allow upgrading easier.
but you really should try the sport out first! find somewhere or someone willing to let you try.
also make sure you put some cash aside for appropriate protective gear!