Should I compress my stylesheet.css

Google webmaster tools is telling me the following

URL
/
Details: Save up to 10.5 KB, 2 requests

Enable gzip compression

Compressing the following resources with gzip could reduce their transfer size by 10.5 KB:
http://www.kamaainadeals.com//includes/templates/custom/css/print_stylesheet.css (313 bytes)
http://www.kamaainadeals.com//includes/templates/custom/css/stylesheet.css (9.40 KB)
http://www.kamaainadeals.com//includes/templates/custom/css/stylesheet_css_buttons.css (789 bytes)
Combine external CSS

There are 3 CSS files served from https://www.kamaainadeals.com. They should be combined into as few files as possible:
http://www.kamaainadeals.com//includes/templates/custom/css/print_stylesheet.css
http://www.kamaainadeals.com//includes/templates/custom/css/stylesheet.css
http://www.kamaainadeals.com//includes/templates/custom/css/stylesheet_css_buttons.css

/blog/?p=12
Details: Save up to 16.5 KB, 1 requests

Enable gzip compression

Compressing the following resources with gzip could reduce their transfer size by 16.5 KB:
http://www.kamaainadeals.com/blog/wp-content/themes/twentyten/style.css (16.1 KB)
http://www.kamaainadeals.com/blog/wp-includes/js/comment-reply.js?ver=20090102 (374 bytes)
Minimize redirects

Remove the following redirect chain if possible:
http://1.gravatar.com/avatar/951493bd93f6458376544bc0c4343467?s=40&d=http%3A%2F%2F1.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G
http://1.gravatar.com/avatar/ad516503a11cd5ca435acc9bb6523536?s=40

I see in my Bluehost Cpanel there is an option for "compress" for each file. Should I hit it??????

Are you actually using CSS buttons on your site? If not, delete the stylesheet_css_buttons.css file.
If you really think your stylesheets need to be compressed, there are several forum threads talking about methods you could use to do it if your webserver supports it. It may or may not even be necessary.
And, no, using cPanel to compress the file is not enough in itself.

All the other stuff is wordpress or wordpress-addon stuff, not Zen Cart stuff.

Would it really be worth any of it to save 27K? Is that a lot?