Which lower are you planning to buy? I'm guessing NEA? I own an NEA lower and it works great and all other brands of parts fit it without problem, warranty service from NEA is top notch as well but there are a lot of reports from guys with bad experiences with parts compatibility and fitment. I bought mine because it was cheap but I probably wouldn't buy another.
For the best bang for the buck and still getting a good quality lower you won't risk having problems with I would suggest you look at Saskatoon Gunworks and buy the AERO Precision lower. They are available in different colors as well which is nice. My next lower will probably be one of them.
I'd also ditch the BAD lever, way too may reports from guys having issues with their rifles after installing one. If you must have one I'd go with the Phase 5 EBR-2. The BAD is appropriately named as far as I'm concerned.
YMMV