Mel, if you can get the time, go to a hardware store/bunnings or a paint shop and pick up as many colour cards as you can. We even bought a CD from bunnings a few years ago that lets you take a photo of a room, and when you load it on the computer, you can see what the colour/s you choose, would look like. I think it was a dulux cd, so only had the dulux colours, but it still gives you an idea.

To make small spaces look larger, light, cool colours will work best.

We have the dark timber hardwood floor too. Our colours throuhgout our house are a light silver colour, and a dark grey. We painted most of the walls in the light colour, but on one side of the house we have done the dark colour. So if I was to stand in our lounge room, and look towards one side of the house, we have the dark colour on all the walls that are on that side of the house. The first wall you see is one that goes all the way down our hallway, and then you eye follows through to an outside wall, that has the same colour. Not the best description sorry.
Our hallway has one side dark and one side the light colour. I was worried that the dark colour would make the space look smaller, but coupled with the light wall, it has actually made it look bigger.

All of our trim is white. Where our walls join we have done white on the trim there as well, even if the walls that join are the same colour. With the white trim, we have made all our light fittings white and silver. so it ties in nicely too. Doors are all getting changed over to new, modern one and painted white as well.

Another suggestion is to go to a paint shop and see if they have a colour consultant that you can chat too. Maybe take some pics of a couple of rooms that you will be painting and ask their opinion on what colours to use for selling. I think people get caught up in choosing a colour they love and don't think that it may be off putting to potential buyers.

I would check out spotlight for curtains, or even target/kmart. When we did our curtains years ago, we ended up getting ours from target. they were exactly the same as the ones we had been looking at buying from spotlight, but a bit cheaper. If you go to spotlight, don't forget to get a VIP card if you don't already have one. This way you may save even more on your purchases.

And finally, I'm a walking advertisement for Dulux wash and wear! It is fantastic for getting little hand prints off easily, something you want to keep in mind for ease of cleaning before potential buyers go through I think it does cost a little more, but really, it is worth it.