I've been super pleased with the BC-ER's on track, over 3000 track miles on some very suspension abusing tracks and no problems. Granted these are a notch up from the base BR's but aside from the external reservoir and extra adjustment I think the basic construction is the same.
The ER's in particular with the 12K/10K springs are probably not the best choice for the street (you can get them with swift springs optionally) but I imagine with 10K/8K springs on the BR's the street ride is quite reasonable, although probably not quite as good as KW's for street. Myself and plenty of others are using BC's for Time Attack and couldn't be happier.
But since you are street focused and on a budget your options are a bit limited. Remember that lowering much more than about 1" will require aftermarket front and rear control arms/links to get camber back within spec. Swift should get you as low as you can go before you have to do that, maybe check out a local car that has them to see if it is low enough for you?
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