Ideally, using the AMPV hull, which also has mine protection improvements and a revised internal layout among others.
But on the whole, if you're sticking with a "medium weight" IFV, you could do much worse than a Brad derivative with a RWS 30mm (especially one that's already in service!) and the improvement offered by newer options like the Lynx may not be a sufficient gain to justify their cost.
With the AMPV, latest M109s, and the like, the US Army is committed to the Bradley automotive components for the next 40 years or so. Makes sense to me to at least try and leverage that.