I've been working on a shooty/infiltrating Chapter which utilizes the "See But Don't Be Seen" and "Cleanse and Purify" advantages along with the "Flesh Over Steel" and "Death Before Dishonor" disadvantages. Here is a list that I want to try out:

Master w/Command squad 360 pts
- Combat Shield, Krak Grenades, PW, BP
CS: Infiltrate, Apothecary (BP+CCW), 2x Lascannon, Sergeant (BP+CCW)

4x 10 Tactical Marines 235 pts
- Infiltrate, 2x Plasma Guns
Sgt: PF+ BP

Heavy Support
2x 10 Devastators 275 pts
- Infiltrate, 4x MLs

Grand Total: 1850 pts