My front Bridgestones are getting low now. What do people recommend to replace with?
Almost anything else that isn't a Chinese/Indian/Korean no make will be an improvement.
Cost vs Performance I would go Michelin PS3 on 18"ers, they offer great grip and are relatively hardwearing relative to their grip and perform well right down to 2mm left.
On 19" I would go Michelin PSS if you want outright performance or Uniroyal Rainsport 3 if on a budget (they were very cheap somewhere recently).
Contis, Pirellis, Dunlops will all do you a better job than Bridgestones.