looking for some decent garden design software

hello. i'm a professional garden designer and i do lots of decks and stonework, but don't have any formal training. i'm looking for some software which can help me w/ designs. i've tried several real dogs, and one which works fairly well and is intuitive, but isn't really made for landscapers. anyone out there w/ some info on a particular program they really like?

thanks for all your help [in advance!]

my best

pete
east bay wilds