Getting to lv60 strength requires less time than 75/80/90 assault so that you may start PKing faster, and mauls are extremely economical  RuneScape goldreplace if you lose it on passing. Power pures have use of the strong Berserk capability, but will have to put money into a couple of attack levels so as to use some of the more useful Attack skills in eoc, and completely lack a distinctive attack in Legacy. Defence levels could be completely disregarded in heritage, but in eoc that the Freedom ability is indispensable. Always maintain your mage/range at half or less of the sum of your attack+strength.

Leaf does make a great point, if double Ascensions are far better than Nox and values roughly the same price there is no reason for you to not receive them instead. Unless of course you intend to perform warbands with the Nox in the future, but that is essentially asking for a catastrophe to happen. No offense to you but much more seasoned PvPers have dropped their Nox bows & comparable weapons due to accidents (forgetting to recharge Prayer and using it drop while they're stunned etc) or due to smite users. And of course you'll get camped hardcore by waves of welfarers hoping to triple their bank that increases the odds of you dropping it and make warbands overall unenjoyable.

Before the previous bxp weekend was declared Nox Bow was sort of steady, worth a fantastic 320M. After the statement it started crashing a lot and ended up falling as much as 220M (when I recall it correctly ). It then went back to 300-320Mish. Could be something like what is happening here, it's very possible it is going to return again. It's not guaranteed however, these things are certain to continue crashing thanks to more getting added to the game everyday.

The grave system makes it quite hard to shed items nowadays, and also the new system being implemented will ensure it is impossible, so it is fair to assume it'll continue crashing. That's life for a RuneScape participant, you either buy the excellent items when they are worth heaps and love them asap (and end up losing money in the long run) or  Cheap RS gold wait eons for them to crash and buy them really cheap when they're no longer a novelty. Look at the Virtus wand + book for example, I paid well over 170M total for mine. Do you know how much they are worth now? Wand isn't even 20M. I suppose it helps having better wands available today, but even before Seismic premiered Virtus was already slowly but steadily climbing.