I suppose if you are only going to use it for plunger grinding, the Breville one would do the job. The RRP is $70.
Another possibilty might be the Sunbeam EM0430 - RRP $80.
I would suggest youll do just as well, if not better, by trying your local appliance retailer and seeing if you can get a better deal in box with warranty (rather than the auction site).
Plus, youll have it right away.
Of course, when upgraditis hits (and funds allow), neither will really cope too well with doing quality espresso grinding.
For the moment though, and for plunger only, I would say either would be a decent unit.