I don't like your choices so far!!...
You don't need a reservoir at all, they make filling/bleeding air out easier that's all. To fill use a
T fitting (13mm copper are least restrictive, PVC ones are very restrictive) at the highest point and cap it with a bung or a valve,if long enough this makes an excellent airtrap as well for catching/bleeding air out of the loop. To make life even easier put one at the bottom for emptying the loop out, then fill it throught the low point while the top one is open and you should have very little air left in the loop...
I would'nt recomend a black ice to anyone either!. Use a copper/brass car heater core if you can find one localy, if not it's worth ordering one from D-tek in the states, by the time you're ready they should have their version of the White Water CPU block which will whip a maze3 all the way, every way!. I own a maze3 and am not keen on it, you can buy it if you want!

(I have a copper HC as well with a 19CMx18CM fin area if you can't find one). If I were you I'd get it all from D-Tek though...
The best place to mount the rad is at the top above the CPU, if you have a pump failure it will curculate by convection and prevent CPU meltdown!. It's saved me quite a few times, takes 10~15mins of loaded CPU usage to reach 45DegC (my warning temp). Either fit it where you said avove the PSU (if it will fit) or mount in onto the 'roof' of the case, this means cutting a 'blowhole' but is worth it as it will give excellent airflow through the case with a well placed fan blowing in through the bottom front pannel...
To recap I'd go:
1X D-Tek heatercore
1X D-Tek White Water
1X Ehiem 1048 or 1250
1X 6foot of Clearflex or silicone tubing 13mm inner diametre
2X 13mm inner Cu(copper) T fittings for fill&bleed points
2X bungs or valves for bleed/fill points
2X 120mm fans for radiator and case inlet (run at 5~7volts)
?!X Zip ties for silicone or 'fuel clamps' for clearflex (NOT jubilee/grub~screw type!)
1X Y fitting for White Water outlets 2into1 conversion (get oversize, they're inherantly restrictive!)
That's all I can think of for the time being :shrug: ...