There are a TON of great L1 kits out there, and they all have their own unique qualities. Not all high power rocket kits have everything you need to fly. Some kits will come with everything you need, but some kits come with just the core parts, and you need to add things like recovery hardware, shock cord, motor retention, a parachute, etc... Just be cautious when you're looking around to make sure you end up with everything you need.
As far as recommendations, it's hard to go wrong with LOC kits. The
LOC-IV,
Goblin,
Warlock,
4" IRIS, and many others are excellent kits. The
Apogee Zephyr and the
Binder Design Excel are also great kits. If you wanted to take the leap into fiberglass rockets as opposed to cardboard, Tim over at Wildman Rocketry just came out with the
Journey 75 which is incredibly priced for what you get. I'm particularly excited for this kit, because it's a fiberglass kit right in the same price range as some othre L1 oriented cardboard kits. Additionally, you could add an electronics bay and a payload bay at a later time for dual deployment, and easily use if for an L2 flight.
Personally, I recommend something that has a 38mm motor mount, as it opens up a lot more motor options than the 29mm mount. Also, with a 38mm mount, you could potentially re-use the rocket for L2 if you decide that's something you want to do.