@ll_exile_ll: If by attempt the raid you mean lvl 24, yeah good luck with that. But for a sane effort at it it will take far better gear and hence more grind.
No, I meant 26. You can buy legendary armor via crucible play, two pieces will get you to 26 after you upgrade them and that would cost 130 crucible marks (between 44 and 65 games of MP) which would be around 10 hours at an average of 10 minutes per game.
And to upgrade your purples you need 6 ascendant shards for each final tier, thats 3 upgrades x2, 36 ascendant shards total. I have been playing for a week for hours a day, i got 6 shards total so far.