Contact Management Software Help

I am looking to buy a new contact management software for my business (sales). Our company had bought us the ACT program a few years ago, and it was serviceable although it was a memory hog. I have read nothing but horrible reviews of the new ACT software ever since ACT was sold to Sage.

So does anybody have a suggestion for a good contact management software that is realatively easy to use and does not cause crashes or hog memory?

I know there are not that many on the market, so your help will be greatly appreciated.

Thanks!