I like the Sazabi, mine's slugging it out with the Nu-Gundam right now!
As for the Evolve MG, it's not a high one on my list as I'd like to see some Wing MG's other than the Wing Ka and WZC, the Turn-A, and even a V or V2 for the old schoolers, but it's a nice touch. However, if I were to commemorate the 100th MG with a model, here's my picks on what would make a great MG kit:
1. Tallgeese 3
2. V2 Gundam
3. Hazel Custom
4. MG Dendrobium kit (although it'd be massive as hell)
5. Deathscythe Hell EW version
6. Gundam X with Falcon Unit
7. Turn-A
8. A truly good Zaku other than the Hi-Zack
9. Bigro
10. One of the Astray frames (though the 1/100 SEED versions are excellent and better than a lot of MG kits)