Actually 3 if you include the cheaper newly introduced partner wallet Citadelle.
HW.1 costs 15 Euros
Nano costs 29 Euros
Citadelle costs 12 Euros
You don't have to buy a Starter if you don't want to - you can download the image and burn it yourself. Also the Starter won't be required with the next version of the firmware as documented on reddit.
I still fail to see why people think it's necessary to mention that - in case that's really important, then the first is Someone42, who made the unfortunate mistake of associating with BFL to release the first product to market. But at least he deserves the credit.
Leaving price out of the equation: what does Ledger Nano do better than Trezor? For the sake of discussion if someone needs to store hundreds of bitcoin with ultimate security is there a compelling reason to use Ledger rather than Trezor?