You may want to check Deskero www.deskero.com. Deskero allows you to really engage your clients, expand your influence online and create a network that goes beyond traditional customer care. We offer 4 different plans (there’s even e free one!) and you can try our best one, the Power Plan, for one month for free.
bpm'online Solutions are cutting edge (modern) and relevant (no unnecessary features). http://www.bpmonline.com/demo/bpmonline.
All solutions are competitively priced, lower than the ones you've mentioned. The low-price does not compromise the quality and quantity of the features: all versions at the same affordable price. What's more, they even have a "Team Edition" pricing for small-to-medium companies. Its a pool of licenses guaranteed to ensure perfect team work.