There is really no upgrade which is better than what you have already.
The mic can be connected with an adapter, 3.5 MM male to XLR..http://www.calibex.com/Hosa-Audio-Adapter-XLR-531824343/cb2/prices-html?nxtg=3250a1c0508-BCBC4DA9BBFE2FA1
The tip and ring of the 3.5 mm plug connects to pin 2 of the XLR
The sleeve of the 3.5 mm connects to the pin 1 of the XLR
pin 1 and 3 of the XLR are connected together and to ground, shield braid.
If you do that it will work just fine, w/ no preamp.
I can tell you that for sure, I am a professional stage audio technician.
Does not need a preamp.
Check the mic level in your mixer and audio software. Your mic level may not be adjusted properly.
I'm not sure what you are trying to accomplish, so explain it with more details.