General Best contacts manager?

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http://androidforums.com – what's the best contacts manager you've found for use on your Optimus V? I've used the stock one for about a year now but find that it doesn't let me filter my contacts as to what Google Group they're in. That is, I have my contacts grouped in the web version of the google contacts manager, yet on my phone, everyone's in one big list. Makes it hard to find people if I only want to consider those in a select group. So let's hear! (General)