Do you have a budget in mind or upper limit on what you want to pay?
I should have mentioned that there are keypads galore out there (using a touchscreen keyboard is a PITA, IMO). The Logitech keyboard that I bought has Bluetooth, so there is no wired connection between the iPad and the keyboard. The keyboard also holds the iPad securely and props it up so you can type without having to hold on to anything. When you’re done, it all folds up into a padded package that protects your investment.