Truvativ is not a great crankset, but either is the 105. i agree with the above poster, if you are going to upgrade go all the way. You can find some really good deals on FSA cranksets, which are a definite upgrade. I also like the double compact more than a triple, but I am just very full of opinions.
<a href="http://www.tkqlhce.com/click-2336811-10391901?url=http%3A%2F%2Fwww.performancebike.com%2Fshop%2Fprofile.cfm%3FSKU%3D21957%26cm_mmc%3DAffiliate-_-Datafeed-_-null-_-null&cm_mmc=CJ-_-2019631-_-2336811-_-FSA%20Gossamer%20Compact%20w%2f%20MegaExo%20BB&cjsku=21957" target="_top">
FSA Gossamer Compact w/ MegaExo BB</a>
<img src="http://www.awltovhc.com/image-2336811-10391901" width="1" height="1" border="0"/>
or
<a href="http://www.anrdoezrs.net/click-2336811-10391901?url=http%3A%2F%2Fwww.performancebike.com%2Fshop%2Fprofile.cfm%3FSKU%3D22526%26cm_mmc%3DAffiliate-_-Datafeed-_-null-_-null&cm_mmc=CJ-_-2019631-_-2336811-_-FSA%20SLK%20Compact%20Carbon%20w%2f%20MegaExo%20BB%20-%20'06&cjsku=22526" target="_top">
FSA SLK Compact Carbon w/ MegaExo BB - '06</a>
<img src="http://www.lduhtrp.net/image-2336811-10391901" width="1" height="1" border="0"/>
are both great options for upgrading. I use the FSA SLK Compact, and I couldn't be happier.
Brian
TheRoadBike.com