Sage will retire Sage Pro ERP in March 2014.
If you'd like to stick with Sage, Sage ERP 300 is one of the company's recommended alternatives. Staying at Sage would probably be your best bet as far as ease of transition, but you can get out our list of top ERP picks if you'd like to make a bigger change.
You might want to consider Blue Link Elite (www.bluelinkerp.com). It is a complete erp solution for small to mid-sized distribution companies.