Either of those will be at the higher end of the price scale. At 48" wide it will be a little cheaper than the 60" and 72" models but not much. I'm going to guess $1400 and up, maybe more. Woods and Landpride are two of the more expensive brands.
An aerator (this type, anyway--the PTO driven models are a different breed) is something that, when you use it, the soil conditions need to be just right or you're not going to get the results you want and your yard needs. Trying to use a rental unit has a couple of problems associated with it--first, they're not always available when the soil conditions are right, and second, the maintenance of rental equipment leaves a lot to be desired.
The first time I rented one (a Landpride) all the stars must have been in alignment--I was able to get the aerator for a weekend when the soil conditions were perfect. However, the previous user didn't clean it out and at first it wouldn't make plugs. It would just poke holes in the ground. So I cleaned it out and in doing so, I noticed that a LOT of the spoons were cracked, apparently from people not raising the unit when turning. When I was finished with it, I cleaned it out and noticed that the bulk of two of the spoons were now MIA. They're out in my yard somewhere, just waiting to puncture a tire.
In spite of that, I was convinced that renting was still the way to go for an implement that only gets used twice a year at most. The following spring, I tried to rent it again but couldn't get it when conditions were right and the same thing happened last fall.
That's when I decided to get my own. But I also decided that I couldn't afford a Landpride or Woods. I priced them all and came to the conclusion that you can get the same thing for a lot less money. I'm not knocking Landpride or Woods as they make excellent products, but you can save yourself quite a bit if you look around and they'll do just as good a job of aerating. (hint: Kyoti)