Vow of Poverty does not benefit any build ever
The benefits of the Vow are worth less than the benefits of magic items at every level, so even if Vow of Poverty was a free option, it would be weaker to have it than to not. But since Vow of Poverty is a feat that requires another (awful) feat, the cost for this self-nerf is very high.
In a campaign with very low-wealth, the calculus changes somewhat; at some point, Vow of Poverty might be better than your items, but that’s basically only if you get nearly zero items to begin with. And even then, it takes a primary spellcaster to make much use of it; nothing in the Vow does much of anything to replace critical magical items for more mundane characters.
In your case, you definitely don’t want the vow prior to getting Wild Shape, as you’ll basically be weaponless (a non-masterwork, non-magical crossbow with no Rapid Reload is very close to not even participating in the battle, and Rapid Reload is another feat trying to make this work), and then once you have Wild Shape you’ll want Natural Spell ASAP, which means the vow doesn’t happen until 9th. By then, there are a lot of items that you’ll really, really want – particularly a wildling clasp and a necklace of natural attacks.
As for exalted feats,
Defender of the Homeland is fairly decent, providing immunity to fear, but only if you stay in your home region. Good in some campaigns with some characters, nearly or completely worthless in others.
Nymph’s Kiss is one of the best skill feats in the game (but as a ranger you should have pretty good skills anyway; you probably won’t need it),
Touch of Golden Ice is solid at low levels but quickly becomes obsolete (save DC doesn’t scale),
Intuitive Attack is excellent (but Wild Shape obviates most of its benefit, since the creatures you turn into will replace your Strength with a number that may very well be higher than your Wisdom),
Words of Creation is broken (for a bard).
Knight of Tyr’s Holy Judgment (Champions of Valor) is kind of hilarious and awesome (you supernaturally sense which laws apply to wherever you find yourself, even if you’re completely lost and have never heard of wherever you’ve ended up), but it is by no means a strong feat.
The rest are quite poor. Since you asked,
Nemesis is a decent benefit, but only for one type. Unless you’re in a themed campaign where a huge proportion of your foes are the chosen type, that’s a complete waste of time.
- It is much improved if you choose the Favored Enemy (arcanists) option presented in Complete Mage. Then it might be worthwhile. Certainly better than a lot of other options you might take with Vow of Poverty bonus feats. Not sure it’s worth a feat on its own.
Exalted Wild Shape is close pointless for you; Master of Many Forms will cover all your “extra wild shape option” needs. None of the creatures explicitly indicated by Exalted Wild Shape are all that impressive, and the Celestial template is exceedingly minor for someone with above-animal Intelligence.
The vows are all pretty awful; the Vows of Peace and Nonviolence go so far as to not only nerf yourself, but also screw over your party (I have seriously left games because a player showed up with those feats without running it past the group, and the DM didn’t make him get rid of them).
So your options for exalted feats are: good if your character and campaign fit (Defender of the Homeland), good for low levels only (Touch of Golden Ice, Intuitive Attack), good but not for you (Nymph’s Kiss, Words of Creation), an amusing but weak option (Knight of Tyr’s Holy Judgment), and an option that’s fairly decent if you can combine it with a supplemental option (Nemesis). You don’t really need any of these feats in any particular way; Defender of the Homeland, Intuitive Attack, and Nemesis (arcanists) are probably the only ones I’d bother with, and I’d strongly consider replacing Intuitive Attack with Nemesis around 5th level, if possible. At two, maybe three feats, you can just take those for the same price as taking Vow of Poverty to begin with, and avoid having to be impoverished.