CD's are just glorified savings account with very little return.  I would suggest dropping the CD for the mutual fund. The mutual fund appears to be very stable and has been around for quite a while. for the last 10 years your fund has averaged 9%
 link: 
http://cgi.money.cnn.com/mstar/FundL...DGAGX&report=2 .  
On a side note, you can start using Viagra and use the excuse that you're helping your investment (Pfizer is your #2 company)
Here's a list of the top 10 and some more info on your fund, 
http://cgi.money.cnn.com/mstar/FundL...DGAGX&report=4
CD's are averaging from what I've found about 2.19% APY. if you were going to be seriously investing, I don't think CD's are your best bet.  You can find mutual funds with longer track records, more companies(less risk), and better return out there. A good mutual fund should yield about 12 % a year over a 5 year period( mine made 41% last year, but lost 8 the year before).   You sound like you are financially stable, why not invest some of your take home pay into a Roth IRA?
But to your original question,   If you don't need the paycheck, invest most of it. if nothing else, you aren't spending it on useless stuff. 
I hope at least some of that helps!