Max stats:
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Of that stuff it's worth knowing it melee's the same speed at 170 dex that it is at 150 dex.
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This is true, but if you get one that's close to 170 dex, it will bless itself up to (or can be blessed up to) a .25s speed boost. A lot of people don't realize this, but it's one of those things that seperates a good rune beetle from a great rune beetle. Also, .25s swing delay seems like a small thing, but it makes a HUGE impact on overall DPS.
Edit, noticed you mentioned str.
Str makes a small impact on pet dmg with pets that have a moderate to low base dmg. The impact on pet dmg with pets that have high base dmg or pack instinct is noticable. Granted, these dmg bonuses are applied before the target's resists, so a lot of times your "bonus" is lost in rounding. The difference in dmg from a max str runie to a min str runie is only about 3 dmg per hit on avg. That's not very noticable...
You should notice a difference based on the str of your pet if you're using packs (pack bonus doubles the effect) or if you're using pets with high base damages such as the warhorses and greater dragons. For example, a min str frenzy pack does roughly 15 less dmg per hit than a max str pack. I like high str on my packs because the primary defense of a pack is their ability to kill the target before being killed.