I doubled my accounts this year as well. This is my 2nd year and first full season. I started in July of 2011. I also dropped some low end accounts and slow payers.
I wanted to add a riding mower but I don't think I can justify the expense just yet.
2008 Ford F150 STX
10x5 Open Trailer
Ransomes Bobcat 36" Walkbehind
Encore Pro Series 32" Walkbehind
Yardmachines 22" Pushmower
Husquavarna Backpack Blower
Echo Stick Edger