So, barring some of the other comments, Glock's are not single action. They have their own action and it takes some getting used to shoot.
Second, the Glock 30 is a fine weapon. However, it is not trivial to shoot and shoot well. Someone has commented you should put about 400 rounds through whatever you are going to carry, and I heartily agree. My guess is you won't particularly like the Glock 30 after 400 rounds because it is exactly what it is designed to be. Light, small and short. None of those things are condusive to learning to shoot well.
Third, you have to understand what "comfortable" means. Here's how I view it:
1) The gun should "point" naturally for you. This means that when you set your grip you can bring the gun up with your eyes closed. "Aim" it at a virtual point with your eyes closed, open your eyes and have the sights lined up. Not high, not low, not side to side. If a gun doesn't point naturally for you, it is something you have to overcome when learning how to shoot it.
2) The gun should allow you to get a "high" grip. Particularly in carry guns, managing recoil, particuarly to prevent from developing a bad flinch, is a big deal. If you are a new shooter with .230 grain Corbon +P+ Hollow Points in a Glock 30 you are going to come away from the range session yanking the trigger like it was a church bell. The higher the grip you can get - meaning the closer the web of your hand can get to the barrel axis the less rotational felt recoil you will have.
3) The gun should allow you to get a good 2 handed grip. No tea cupping, but a solid two handed thumb over thumb style grip. Again, mroe experienced shooters can compensate for small grips, but they are really hard to learn on.
4) The trigger should be easily in reach when you have the good grip. Particularly if you have smaller hands, Glocks aren't a great choice because the trigger starts out a long ways away compared to a 1911 style weapon. If you have to adjust your grip to reach the trigger it's the wrong gun.
So, all of that being said, and assuming you really are willing to learn how to handle a gun responsibly, there are very few "sucky" guns among the top makers. Smith and Wesson, Colt, Para Ordinance, Glock, Springfield, CZ, EAA, Kimber, SIG, H&K, Kahr, the list goes on and on.
While you've said you want single action, what is sounds like is you don't want a DA/SA gun where the trigger pull changes after the first shot. Not unreasonable. Learning to carry a true single action semi - auto is a responsibility though. Generally you are carrying hammer back, round chambered, safety on. You are hot from the get go with generally a short trigger pull. Someone mentioned a Kimber Pro Carry - excellent choice if you want to go this route.
Alternately, you can look at something like a ParaOrdinance in their LDA or Light Double Action. This gives you a light double action trigger that is still in the 4 - 6 lb range. Some people view this as safer.
In plastic guns, many people carry Glocks, but as mentioned, no external safeties. If you don't want it to fire keep your finger off the trigger. Since that is the most common error that new shooters make (leaving their finger on the trigger) you will have to practice.
There are also the Springfield XD, H&K USP, the Sig 250 and a few others.
Fundamentally, don't buy a gun because you like the "look". Buy the gun you can SHOOT.
Thinkingblade