av200 tops out at 33 mbps - would av500/600/1200 help?

I'm in a 75 year old house and my Lea 200+ is topping out at about 33 mbps. Would getting a faster powerline adapter set help? I was going to try a $70 av1200, but hear av1200s have more noise sensitivity than 500s. Any recommendations, besides buying and returning different ones? Thanks

Thanks