What color megabait charlie would you guys suggest?

*I only fish a few places that hold both lmb smb and trout most others do not have any trout in site

What size 4 5 or 6 inch?

* I am fishing northern strain and targeting bass 4lb-6lb on average though there are bigger bass around here.

anyone?

I am absolutly no expert, and have very limited experience with swimbaits but I'll take a stab anyway.

The charlies are pretty bad.  Save your maney and get a few higher priced better quality SB's.  I have around 15 charlies and most of them ran crooked out of the package.  

Pick your color according to the water color.  If the water is clear, throw a SB that is as natural as possible.  If it is muddy, throw something dark.  If the water is moderatly stained I like a chartruese, or other bright color.

The bigger the lure, the bigger the fish......usually.  Sometimes you'll get a greedy little dink whos eyes are bigger than he is.  

Make sure your using the proper gear.  You'll need a rod that can throw a lure that weighs 1=4 ounces.  You'll need line ranging from 17#-25# and maybe more.  

Check out this article by fourbiz from the forum.  He is a cali-trained swimbaiter.

http://www.bassresource.com/fishing/swimbait_gear.html