Decide if you want a 9mm or a .40 cal to begin with.
Preferences on finish will make a difference on what models are available.
Preferences on what you want it for. Some come with adjustables and others come with fixed sights. If you have other than adjustables, you'll end up changing out the sights, so be prepared to pay up front to get the sights you want or later to have them installed. Many folks have Novak's installed. They have a variety of combinations you can purchase.
The only "light" model they make is referred to as the "Lightweight" and is aluminum. You can tell the difference between it and the cast and forged models. Significantly lighter and suitable for carry. The cast and forged are pretty heavy for carry weapons. The lightweights are pretty rare and all of them need to be refinished and contemporary sights installed. You can find them for about $400 or so at Ohio Ordnance Works.com occasionally.
While we are talking cast and forged, either is acceptable. Forged always sounds stronger but in fact the cast was made for the heavier .40 cal BHP.
Be careful when it comes to "clones." There is a lot of misinformation out there on those. Two of the most common clones are the FEG (Hungarian made) and FM (Argentine made), not to be confused with FN (Belgian made), which is NOT a clone.
Bottom line, work on any pistol, finish, sights, etc., is expensive. Whatever you put into the pistol, you will most likely NOT get back out of it at re-sale.
Hope this helps!