I think you can get to the 375 point where Lightning bolt cast time will be down to 1.5 seconds and when bloodlusted the gcd/lightning bolt cast will be 1 second

belt +34 haste (+10 haste)
http://www.wowhead.com/?item=34935

Trinket
+40 haste
http://www.wowhead.com/?item=35327

Shoulders
+33 haste
http://www.wowhead.com/?item=33970

neck
+21 haste (+10 haste socket)
http://www.wowhead.com/?item=35319

legs
+38 haste (+20 haste socket)
http://www.wowhead.com/?item=34934

hands
+24 (+20 haste)
http://www.wowhead.com/?item=34791

ring 1
+30 haste
http://www.wowhead.com/?item=35320

ring 2
+18 haste
http://www.wowhead.com/?item=34704

chest
+51 haste
http://www.wowhead.com/?item=34933

back
+16 haste
http://www.wowhead.com/?item=35321

total 355 haste

Throw in 2 more +10 haste gems somewhere and you should be golden.