Get an ABC powerlifting barbell. It's the one near the end of their list. They aren't expensive, compared to a competition barbell, but have a very similar feel and is a "stiff" bar giving you better control during the lift.
Personally, I'm at the other end of the spectrum from Mick. But then I compete in powerlifting and Mick works out to look like a Greek god, so we have different goals. If your goal is to get better at the basic powerlifting lifts, get a bar that is close to what you would expect to find at a comp.
I can't give you the model number as I am in a hotel with crappy wifi and it won't load the page, but just use The Google and look for their powerlifting bar (www.australianbarbellco.com.au). Last time I looked it was on the second to last or last page. You want the one with a centre knurl, powerlifting knurl markings, 28mm diameter shaft but specify that you want the "aggressive knurl". I think I paid $400 for mine a few years back. Within a month, everyone in my gym was swiping my bar for workouts (I stored it in the gym). That's how obvious the difference was in feel and operation. It even made a difference with bench press.
I have a competition Eleiko bar now (I think they are around $2k in Oz now) and the feel and stiffness is almost the same as the ABC bar, except the Eleiko has a less rough knurl, but seems to actually grip better. Not sure what magic is happening there.
Don't be the guy with a $200 barbell being used in a $1-2000 power rack. A power rack is just a hat stand for your bar, the bar is the important bit.