Good Evening Again Mr. Smitty.
Well, you have bought a Cadillac motherboard, so I wouldn't suggest that you put $25.00 tires on it. Believe me, you won't be satisfied with running your proc at stock speed for very long, if at all. Therefore, spending a couple of bucks now and installing a good CPU cooler from the beginning just makes sense. Besides, you will likely have to remove the motherboard from the case (and all the pain in the butt that is entailed in that process) to eventually install a good quality aftermarket CPU cooler anyway. Therefore, to save yourself all that eventual hassle, DO IT NOW!
The Zalman 9700 has worked very well for me, and it is solid, stable, and won't come off the proc, no matter how you twist and turn the case. Of course, in the final analysis it's up to you, but you asked my honest opinion, and what's written above is that honest opinion. Enjoy. TheBeagle