The real benefit of speedbows is versatility while still remaining fast. I would recommend you have 4-5 towers and make room for some CC. 2-3 explosions is enough for perm control, and with 1-2 Arsenic(s) and 2 Fog Shields (which you really, really want), you have little use for steal. Skip the cremations, RoL's, Ruby Dragon, Eternity, Pufferfish, Elite Wyrm and remove one Physalia. Add 2 Lightning Bolts and Shockwave/Congeal.
The Fog Shield will basically boost your HP by 40% most of the games, as you will be able to play it early. It's truly amazing and a must have in rushbows. Oh, also, I prefer Blessings to Archangel and Unstoppable is a very good buff for a rushbow as well.