I have both the Akagi and Shokaku but they are both Fujimi models. To be honest, I don't know which manufacturer makes the superior version.
A search showed the Akagi (Hasegawa) at around £31 and the Fujimi version at around £51. I bought them both direct from Japan at around £30 but the shipping cost would make it around the £50 area for each of them (bought them at different times). No PE with either model.
I bought them a couple of years ago, took one look inside the box (so many parts) and thought that I was nowhere near ready to tackle them yet.
I'm thinking of buying the Chitose after it was converted to a light aircraft carrier. i thought it would make a good companion to the seaplane tender version.
A review of Fujimi's Akagi
Akagi
Fujimi serves up another IJN Akagi for wanting WWII carrier fans. Alec Gerdow gives us his review of the Imperial Japanese Naval Aircraftcarrier Akagi kit.
modelshipwrights.kitmaker.net
Edit: the review mentions PE, which my version does not have. I'm assuming this is why the Fujimi Akagi I mentioned is more expensive than mine.