Which xenos faction should I play?

I've been thinking about starting a new army at some point, and I'd prefer to play a xeno faction, because they aren't humans (I have two of those already, if you can call marines humans). I really like Tau, but I'm not sure how I'd want to play them; Necrons are cool, but I'd rather not paint silver if I can avoid it; Orks have too many models to be practical; Dark Eldar are neat, but I don't want to have to figure out how to move all those vehicles (and I prefer infantry); Eldar are bullshit; Tyranids have the same issue as Orks, and my friend Jess plays them; Genestealer Cults seem interesting, but Jess wants to get into them too so again, I'd prefer to avoid that overlap.

Generally, I like infantry, smaller model count, and to play in between all out aggressive melee (like Grey Knights) and hunkering down and shooting (like Crimson Fists).