Dan don't listen to "barrack room lawyers" on this important decision.
Try and get hold of January 2009 issue 161 of TBM magazine.
This copy has a section called "massive dirtbike buyers guide"
It lists every bike you've ever heard of plus a load you haven't, with an indepth write up on each.
KTM 450 EXC is headed up as
THE enduro 450. There isn't better in my opinion.
As a newbie to trail riding you may scare yourself on a KTM 300 - 2 stroke
Can I suggest you look at a 250 - 4 stroke. Their less likely to let you down going through a ford.
If you don't want a KTM, the Yamaha WR250 is probably the best alternative.
The CRM is a good machine although its a grey import and they don't make it anymore,
also, its not got an electric starter. The two I've mentioned above have.
When your up to your ears in a bog, getting tired and can't get a good footing, kick starts are a pain.
CLOTHING.For your own safety - Helmet / Goggles / Body Armour / Knee Armour / MX Boots, are a must.
The rest of your gear is there to keep you warm, dry and fashionable.
A few visits to your local TRF Group will enlighten you.
I'm sure the members will be more than happy to give you their views before you started handing out your hard earned shillings.
Good hunting