are you looking for pure chile powder? like, say, ancho? or are you looking for a pre-made chili powder?
If the former, good for you. I love blending my own rubs and spices and chili powders. For the most part, I ground all my own chiles, but if I were to raid a penzeys for some pure chile powder, here's what I'd get:
Aleppo (folks here (kruger in particular) rave about it... I haven't tried it but plan to on my next penzeys visit.)
Ancho
Jalapeno
Chipotle (I love chipotle powders and use it all the time. However for a rub that will go on smoked meat, I don't use much chipotle since the smokey flavor of the pepper is lost with the rest of the smoke flavor...)
Guajillo
Arbol
Cascabel
I've been tempted by the tien tsin and piquin, but have never tried them.
Good luck and have a blast experimenting.