The Blorb probably would be better if you're not going to attach the Delta fan to the stock heatsink. In my opinion, that would be overkill anyway. Don't think you can reverse the fan on the Blue Orb either...not completely sure because I don't have one. Set it to blow on the chip though. Only some heatsinks are architected to make use of pulling heat away from the heatsink effectively and neither of these are them.
Blorb's are cheap and the Delta fan is way too big, save it for something else.