The half rack doesn't look like there would be much room to manouver your feet (actually the same goes for the squat stands, when used for squatting, as the pink girl demonstrates).
The only time you will need the safety bars is when you are lifting something too heavy for you to handle at that time - and then you will want to be able to put your feet wherever you need to, to be able to stablilise yourself, and you will also not appreciate having such a tiny target to set the bar down on. I'd say get a power rack.
For benching without a spotter, the half rack looks good - but then you could do as I have done, and get a couple of saw-horses from Bunnings ($15 each) to do the job.