CamBam - easy to use but quite powerful.
Good built in drawing editor but will import DXF.
Great machining support with hierarchical styles so you don't have to reinvent the wheel all the time
Good support forum.
Reasonable price
Free trial
www.cambam.co.uk - look on the forum under announcements for the latest version
Still in beta but don't let that put you off - it's ready for use just evolving a bit.