Ultimately, you purchase want you want. It's your money and you're that individual that will be utilizing your tools! I started with a Iwata NEO Gravity feed AB. It's made for beginners like you and I and the pros love it as well.
Check my builds that say Toshi, I AB 90% of these aircraft with the Iwata by NEO. It has a Five Year 100% return policy. They also make a trigger AB of which I'm in love with (Gavity Filled) and a siphon as well. My next AB will be a a top of the line AB.