Seems like a lot of people focus on getting 90-100 percent Crit rate on any DPS class. Is it possible that having say.... an 80 percent crit rate and then using a buff or Bard in your group give you 100 percent would actually optimize your dmg since you've have more of a chance to focus on P-DMG, Luck, +Crit Dmg, etc...
Also lets say you just leave it at 80-85 percent, wouldn't it be more advantageous to increase your base damage more since the damage that a crit actually does is based off of this? Perhaps we have some number crunchers among us or perhaps we have some people here who've tried both routes.
Rangers have an awesome passive of 30% crit rate, making their crit rate easy to cap. It depends on your gear. For example, my ranger has a base 100% crit rate. Taking out BOTH crit rate certs and the luck cert, my crit rate drops to 87% >_>. This is using an awakened set with pretty good forts.
Other classes/races w/o crit rate passives aren't as lucky. Similar set up, my human BD/MA roughly only has 80% base crit rate compared to 100% from ranger.
Because you eventually want to hit 100% crit rate or at least 90%+, it is advisable to try and get the right set up to achieve that. What you said, however, is true. You'd have to consider other ways to raise crit rate to give room for other procs and resources. My base 80% is enough, and using war pots (5% crit rat), couple buff, shammy/cleric buffs, and king strike (attack and crit rate proc) are more than enough to get to 100%.
3.0 crit dmg is easy to get for some classes (particularly 1h DPS) though it depends on if you use unique weapons vs purple (some unique weapons have crit dmg while others dont), roll crit dmg on fort bonuses etc. Make sure to get a full set of crit dmg glyphs.
There's rarely a situation where you have to choose strictly between base dmg vs crits other than heroic traits. Better way of saying, both exists in the most efficient builds. Most of your p-attack comes from fortifying weapons and you have enough KP to get both crit rate KP and weapon KP. The harder side of DPS is sacrificing some damage output to be a bit more bulky. No point in being a DPS that steals aggro and can't take a hit xD.