Thanks very much for the info, that helps me a lot, now to order the kit also and see how it goes.
Had some great results with PLA but now time to go ABS i'm finding PLA a little weaker and bit brittle (even the reinforced stuff).
Regarding the PC PSU, it should have plenty of power left over - it's 800W and manages to put most of the power on a single rail, but i'm not sure exactly how to wire up the hotend to both the PC PSU and the Ultimaker. For the heated bed, I used a totally separate circuit (mosfet/switch), with a small oled screen and a rotary encoder to monitor the temps and set the time.
Any tips on this would be great, i'm also interested to hear what makes/types of ABS you've had most success with.
Thanks again