I rode a half step setup for years with a 14-16-18-21-24 five speed for several years in the flat lands and it was perfect and there was always a gear where I needed it. Great gear spacing. I have changed that bike to a triple 6 speed with the exact cogs you are looking at. It has worked out great here in the HILLS. Now it I can just get the crappy weather to break so I can get back to the bike. I think you will like the cog choice. I would also suggest changing to smaller rings but I spin around 90......good luck