If you are going to pay monthly you should just stick with organner or x22 etc. Paying a coder to have him make a private build is normally a once off payment.
And payments are pricey. The cheapest I have seen that I would use would be ring0's valkrie which costs around 300 euro for a year. The other one I know of is avitamin and he charges a lot more but it is a once off payment.