The Orvis Recon 5wt is a great rod. I would use that out of my Fish Cat.
Questions to consider for lake fishing: How big are the fish you are looking to catch?
How much wind will you be dealing with?
How long of leaders will you be casting?
For me, I often find myself using long leaders( at times over 20ft), with some heavy flies under an indicator under some pretty windy conditions. I like to go where there is fish over 5lb. These kind of situations tend not to be the best for a 4wt. Like mentioned above, a 6wt is usually a better choice. Your fast 5wt Recon would work as well.
If you are fishing in nice weather, with smaller fish and lots of chance to fish dries, a 4wt would be nice. Why not a Recon