My old Ohlins/Eibach combo is much better for the street than the old TEINs I have. The Eibach springs are soft compared to the TEINs.
If you're after numbers, I would run around 4-5kg springs for the street max. Note that Nismo S-tune suspension have F:5.5 R:4.5 kg/mm springs.
Standard are around F:3 R:3.5 kg/mm from memory.
In saying that, if you're after cheap, HSD ones are pretty decent (from what I've heard and read). Local support and you can change springs (check out otomoto).