The problem with many Twitter plugins is that they become outdated quickly as Twitter changes things like authorization and the API.
I use the rss to tweet module in
Tweet Deck which will automate randomize your tweets by pulling your RSS feed. It will also allow you to schedule random spun tweets to certain # subjects and allows you to easily manage and gain followers. It's about the best Twitter marketing tool around and it's RSS integration means that you can manage hundreds of blogs from one tool.
Tweet Deck is a one time purchase unlike third party sites which perform feed management for a monthly fee. You own Tweet Deck yourself and have total control and are not limited by the pay per month services.