Hmm. Any of the Barbatos, Deathscythe, red frame Astray, double x, leopard davinci, Throne Zwei? Its great with gundams because are a nearly inexhaustible amount of them to choose from! Literally a gundam for everyone. My favorite is the G3 classic gundam. If you are really feeling adventurous try picking by virtue of the v fin alone!!
HG Build Strike Gundam Full Package. It was my first build ever, and still my favourite. I even got one the other day to see how far I'd come from that first day. It's an easy build, with great articulation and aesthetics to boot.