About the only Lanzar amp to recommend would be an old school Opti drive if you can find one. they used to be built in the USA from my understanding. what kind of speakers are you going to use with this new amp.
Sundown is a very good choice. I went with Jacob(the owner) for my subwoofers. He is a very stand up guy that has a good head on his shoulders. I purchased a Sundown Audio V series 12" subwoofer from him. The first one he made had a dimple on the cone that I sent him and he purchased a new cone and remade the the subwoofer and sent it to me. He kept in touch with me even afterhours of his shop. To get ahold of him directly you can email him at sundownz@sundownaudio.com
You can probably find a used one for cheap over at caraudio.com in the classifieds section. He frequents that website just about everyday. His sn is sundownz.
Sorry I got off track...would you consider used or are you wanting new?