i wouldnt use arctic silver 5, id go with a newer tim. maybe noctua(my personal fav), or shin etsu. i heard mx3 is good too. but as5 is by no means the best tim out there, and if you are going to be spending 10 bucks on tim might as well get one that works better.
btw, the rasa kit is great. and alot of fun to install.
edit: also, depending on your setup, there is going to be lots of leftover screws and bolts and what not. the instructions that come with that kit are garbage as it only tells you how to install the water block. the rest you kind of have to figure out on your own. took me a while to finalize my setupd i was up till 430am installing mine. pm me if you have any questions about anything. i can tell you my setup and what not.
also do yourself a favor, google: rasa 750 install video. watch as many videos as you can before you install. also be gental with the pump/res as it is acrylic. its very easy to strip threads in acrylic so dont over tighten anything, but at the same time make sure a good seal is formed.
1 more thing, rinse your radiator with distilled water a few times before installing it, then let it dry.