If you choose to use a neck die, then you'll still have to intermittently have to use a FL die. I've used neck die's off and on over the years, and usually by the 2nd or 3rd neck sizing, I have to bump the shoulders, other wise the brass will not chamber, or if it does it requires excessive force, which causes galling of the bolt face.
Then there is the question of whether necking enhances accuracy. I've done a fair amount of testing, and with various cartridges. In my experience, the amount of accuracy enhancement was either undetectable, or so minimal, that I couldn't make a conclusive determination. In some tests I actually consistently lost some accuracy. This is probably due to the fact that production chambers are often not true, they may be slightly out of round, egg shape as it were, or not perfectly square to the barrel. So unless you index the brass so it is in the identical clock position as when fired from that chamber, the bullet will not enter the barrel consistently even.
Then we have case life, which is yet another very debatable matter. IME and opinion, when a FL die is properly adjusted, which means making absolutely sure the shoulders are not getting bumped more than what's necessary, case life can be just as long as with a neck die. And in this regard, there can be a down side to necking.
Another something else to consider, and that I've personally experienced with belted cartridges when neck sizing, is that the area between the belt where the FL die reaches, is prone to, and can get pushed out. Once this happens, there is almost nothing you can do about it, and the brass becomes useless. I know of at least one company, Innovative Technologies, or IT that claim they're collet die will size that portion of the brass, thus extending the life of belted brass significantly.
Using properly adjusted plain old RCBS FL dies, I have little trouble getting 12-15 loads off of bottle neck brass. Some rifles I have will go even longer, just depends on the chamber, loose, tight, square are all factors that effect case life. I have a particular production rifle, a Rem 700 chambered in 7mm RM that gives me no less than 15 loads with every day factory brass, Win., RP, even Federal. Other 7 mags, including other 700's will only give me 10 or 12 loads, it just depends on the chamber.
My recommendation is to buy a decent FL die, such as RCBS, and then learn how to adjust it properly. Then focus your attention on good load development technique, component quality, and preparation. Annealing will also help to prolong case life by minimizing case neck splits.
