BigBen2K:
About running Rios in-line; yes there is a way of doing it. I have a Rio1100 and modified it to run in-line and it's been chugging away for almot 7 months now with no signs of death in the near future.
All i did was went to the hardware store and got some brass fittings, sand paper (250grit) and 2 part epoxy. Sanded out the intake and the exhaust lines until the brass fittings slide in snug and then sealed them in there with a nice serving of the epoxy. It has never lost a drop of water for 5 months now (even with a slightly cracked intake housing
Dont have pics avaiable right now but can get them per request.
Mine barely gets warm to the touch running in-line but then again I have it right in front of my case fan (not my radiator fan). Some air flow around that type of pump would probably not be a bad idea.
BTW many people have said that Rios are POC pumps and that they die often. Well this may be true again if you turn your pump on and off twice a day. Mine has it's power cord going right out the back of the case into its own power outlet and runs 24/7. So far the only time it even makes noise is when I change out the coolant and get some bubbles in the system.
From my experiences, they are decient pumps (not the best but decient enough to work reliably for 24/7 operation)