Hiya,
Saim-Hann is a very beautiful army once it's all painted. They use bright red with black stripes and that has always caught my eye. Most Saim-Hann armies used alot of Jetbikes since they are so cheap and count as a troop choice. With the release of 5th, and troops being the only units that can hold objectives, this creates a slight problem.
Jetbikes are not great. T4 with a 3+ save is not very solid conserdering they only have a 12" S4 assault 2, twin-linked weapon with a
BS of 3 anyway. So they hit, and wound on 4's and only at 12". Makes they weak to small arms fire since a squad of Marines can pump out as many shots as them, and score more wounds due to lower toughness.
If you wanted a full blown Saim-Hann army that follows fluff, I would say look into Prism/Falcons, Vypers, and several squads of Jetbikes, like 4-5 in each unit. Take the Autarch on a Jetbike, and a Farseer if you have the points.
I used a draw tactic for my Saim-Hann. Prisms would take out larger units, linking with another Prism. Vypers would take Scatter Lasers to deal with horde armies, or just mass marines. I would use both my Vypers, and Prisms to whittle the units down, then move my Jetbikes in for clean up. This would weaken the "return" fire on them. Also, given the Vypers can move 12" and fire 36", this would force the other player to come to me. My Vypers would just stay on one side of the board and move 12" forward, and 12" back the next turn.
Hope this helps. I'm having problems finding lists for 5th with my Eldar.. Maybe we could figure this out together.