Son,,U got Options !
I started on a HT 29er to get healthy and became addicted to the sport. I moved to a Full suspension for many reasons but the only regret I have about my Hard Tail is trading it in to lower the price of the full suspension..
The Hard Tail was a great teacher, often forcing me to use proper form and technique.
The full suspension let me ride farther and faster all the while beating me less when I made a mistake.
Hard Tails require, no DEMAND you to get out of the saddle where you should be when things get dicy.
they are lighter overall and require less maintenance..
My advice is so so complex: SUPPORT YOUR LOCAL BIKE SHOP !
They should know the trails you will ride and what works there, and you will need their support along the way.
Your first bike wont be your last but remember,,
IF your LBS advises you to step up in price a little remember the oldest of lessons, You Get What you pay for..
A good bike makes a huge difference and good bikes cost money.
Relax on your first bike, pick a perfect fit above all else,,and a cool color
Everybody knows red and black bikes are faster
My old Hard Tail:
I rode the snot outta this bike !
My current speed steed and my passion:
Good Hard Tails can be had for $1,000.00 At this level you get a keeper.
Decent full suspension may start at $2,000 but when you play at this level you will want to upgrade the thing pretty soon
Good full suspension starts at about $3,500....
Don't do carbon for your first bike..
Good carbon is,,,good, very good and very expensive,, less expensive carbon will beat you to death..
I lasted 2 miles on a cheap carbon bike I rented...
I must stress this:
Don't get all hung up on wheel sizes, 27.5,, 29er,, 27.5+ 29+
Get your bike,
Get a good hydration pack with all the proper things Inside for the ride and your body
and wear out your tires