In the end i bought an AEG combo of brushless cordless drill, brushless cordless impact driver (200Nm), 2 * 2.5Ah batteries and a charger. I also got a 125mm 1100W angle grinder with 20 discs. It was $498 from Bunnings all up.
It was meant to go straight into santa's sack but i couldn't help myself, so its all been opened already. I'm happy with the quality and the drills feel really good in the hand. They are light and powerful. The drill has 3 modes (hammer, drill and screw) and 2 speeds. Its good for drilling the holes and then driving screws slowly which is what i needed as in the past i always strip the heads. Doing some tests with the impact driver was great as well. It can drive a 50mm screw into a batten in the blink of an eye.
Interesting to note the 6 year AEG warranty requires that you upload a copy of your receipt within 30 days to the AEG site, which i have done and has been acknowledged by AEG.
I want to thank everyone for all their tips and advice in this thread, has been quite useful to me.