Here is a start to your question.
There are three general areas of accuracy: 1 the gun, 2 the shooter and 3 the cartridge.
With a standards press and standard dies you should be able to make bullets that will shoot less than 1 MOA by working with the powder, primer and bullet combination.
To get under 0.5 you need a gun and shooter capable of shooting that good. Then you need a reloading process that will provide a cartridge that will shoot that good. I don't much shoot better than 0.5 to 1.0 MOA so lots of fancy reloading tools are just things to keep me occupied and take up space in the cabinet.
Before you spend $500.00 on more tools I would make sure that it is the quality of the cartridge that is at issue and that you have mastered the fundamentals of basic reloading. Reloading is a dangerous hobby and one should carefully read the manual. I am a little concerned that you did not know you had to trim cases.
Any way, the easiest and cheapest next two things to do are to get a flash hole deburring tool and a primer uniforming tool. These do not cost much and will help you get uniform ignition.
After that I would advise you to do what a person (3sixbits) advised me to do but being stubborn and contrary I did not follow his advice. GET A DIAGNOSTIC TOOL. Concentricity gauge- NECO is about $150 and now goes way down into the ten thousands range. Others make tools for $50-$75.00. This will tell you at which step you are getting misalignment problems so you can focus in on the problem step.
Now then, here is a very good description of what people who have a lot more experience than me have to say. In my opinion you can trust what 3sixbits and ABINOK have to say.
I still say that with a basic Rockchucker and RCBS off the shelf dies you can fabricate subMOA cartridges and that will get you to and beyond 1000yds. Do not expect to see miracles from spending $500 on new neckturners, benchrest seaters etc. This just fine tunes an already good cartridge.