The problem with this is that it only comes with one SATA Power, is it possible to split it?
You can buy 4-pin molex to SATA adapters.
http://www.scan.co.uk/Products/330W-Sea ... -120mm-Fan
I like the look of this PSU, my only concern is that its 330W. I think my power requirements are quite frugal, for now only 1 HDD ( I forgot to mention also an Internal DVD writer).
I appreciate that HDDs require more power when spinning up, but if my system operates at about 100-150W, I would like to get no more than 300W, or is the difference between between 300/330 Negligible ? Also I have read that if the component draw is too low for the PSU, the system may not even power up, could this be an issue ?
The difference between 300 and 330W is not worth worrying about. The point of using a PSU with Wattage close to your requirements is to be in the efficiency sweet-spot. A 330W unit is unlikely to have a markedly different sweet-spot than a 300 or even 250W unit. For that matter, even going up to 450W or even higher wouldn't be an issue, it's just at a certain point you end up paying for more PSU than you need.
Also I have read that if the component draw is too low for the PSU, the system may not even power up, could this be an issue ?
The configuration you posted wouldn't put you in danger of such a thing, especially so if you went to multiple HDD. Remember, the HDD use the most power right at power-on and that is the only time at which you would be concerned with too low draw on the PSU.