[BDG]

First thought is the bike going to be mainly for off road fun with very little road use, or will it be used for commuting/running around as well? This affects what to chose, also what sort of budget?

I would agree that KTM 450/WR 450 may be a bit much for a novice.

Rough guide i would suggest
Honda XR 250 or 400 No electric start though but very reliable and novice friendly.
Honda CRM 250 (2 stroke)

Suzuki DRZ400- v quick engine

Yam WR 200 (2 stroke)
Yam WR 250 (gotta rev it mercilessly)

Kwak KDX 200/220 (2 stroke)

KTM 250

As a starter bike i'd stick with these, avoid converted MX bikes, and obscure model imports, Huskys, Husabergs, Gas Gas. Actually Gas Gas do some great bikes but their quality control is questionable.

Loads of stuff advertised in TBM (trail bike mag) along with a guide to second hand bikes in current issue, or Trials and Moto Cross News for more adverts.