If you dont want to use valuable spreadsheets prepared by good people here, let me give you some rules to follow along the way to 2004 haste. It wont be the best way to reach 2004 haste but wont be bad either.
stat priorities
intellect: Never sacrife intellect for haste. Maybe a little to past a nearby breakpoint. Always use gem for int, but you will need 2 yellow gems for best meta gem(
[Ember Shadowspirit Diamond]) to work on you, choose them for haste.
Spirit: It is your first priority to have mana until the end of combat. If u have mana problems, take mana talents moonglow and furor. DO NOT MISS a clearcasting proc ever. Use innervating each other with another druid,use mana pots. If you are having mana problem with them, you are doing something wrong. If you left with mana at the end of combat, drop mana talents and get healing ones.
And again do not miss a clearcasting proc ever, it is unbelievable mana source. Do not use it with swiftmend. Clearcasting worth around 4k mana if you use it on healing touch.
Reforging spirit to haste? Ofc,no. Just not being in need of reforging stats to spirit is enough.
Do not forget reaching 2004 haste ratings is really about managing your mana so you wont gonna need more spirit and you can reforge into haste instead of spirit.
Mastery: Dont mind it if sacrificing mastery will take you over any haste breakpoint. Reforge it to haste.
Crit: It is really weak stat for now reforge it to haste>spirit>mastery.
Gear
I will again give guidelines.
Check Lightflower's gear list in first page of this thread there are a lot of items with haste+spirit. Get them. If you can get an epic item without them instead of blue get it and reforge. You can buy Valor boots, Dragonmaw rep belt is superb. Use your valor points to take your tier gloves first. Enchant your bracers and boots for haste, BIS enchants are expensive for them. If you are alchemist craft your trinket. You can reach above 2000 without even get a single item from raid.
Now when replacing your blues with epics during raid, your strategy will depend on your guilds loot rules. But on your first loots prefer ones with haste like
[Passive Resistor Spaulders] form Omnitron or your tier helm. If you start raiding with gear by follwing above mentioned rules, you will not have problems for keeping 2004 haste by getting new items without haste. Of course you have to reforge your new items into haste.