I thought the opposite was actually true. Start with a Robur and work your way down.
You should always buy the best possible grinder that you can afford - now someone using a stovetop isnt necessarily going to want to buy a REALLY expensive grinder, but regardless of the coffee machine/style the quality of the grinder and beans will always shine through.
For example, I could never get my Sunbeam 0480 dialled in to make good plunger - no matter how hard I tried to fine tune the settings. As an experiment I brought home freshly ground coffee from Campos specifically ground for plunger, consumed within 30 minutes of grinding and it tasted better than plunger ground fresh from my Sunbeam.
My point is that the inconsistencies in grind from a cheaper grinder would possibly come through in the cup - even in stovetop or plunger.
The question is how much is a reasonable amount to spend for this purpose? Maybe Sunbeam as rock bottom choice, but if budget can be stretched a little further maybe an ibertal challenge for about $300 might be a good option?