OP, if you check out the Search function you will see a ton of information about purchasing a machine, including pages of discussion about different models. As to the drop weigh versus LO debate, it's a total red herring--they simply operate differently--there's no more "accurate" as between the two anymore since it's all a matter of reference tension---LOs pull and stop at the tension while drop weights tend to pull constantly for that extra second or two it take to clamp the string--that's it. And like one poster stated above, the DW needs to be level each time. To the extent there is a difference in methodology, it can generally be compensated by adjusting the tension of the machine--e.g., pull 50 on a LO but maybe 47 on a DW, depending on string and many other variables. LOs are typically significantly faster (there is an "automatic DW" made by Stringway which helps solve the speed issue, but I suspect it's out of your price range).
Shockingly, the more you are willing to pay, the more choices you will have and generally, as price increases, so do feature. That stated, if you are simply stringing a few racquets a month for yourself, any of the budget DWs will be fine (they may take you longer and not be as efficient but with experience, you will be able to produce consistent results in an efficient time--many posters on here do just that). However, many stringers find that process too tedious and less enjoyable than more efficient stringing machines. In my view, I would look at good clamps first (and fixed are typically better (although there are a couple of non-budget flying clamps that are quite good) and then at the mounting system (6 pt is great but a Neos 4-pt is every bit as good and super quick (and I suspect also out of your range). From what little I can tell from your postings, the Pro's Pro you mentioned should be quite adequate for your needs--it's not a machine really built for the retail stringer, but it is more than enough for the player who wants to string his own and a few others, maybe experiment, save some cash and enjoy the stringing process. Good luck.