60/60 does look good and (as rob says) is what i have in my car. it's low, but oddly it doesn't look stupidly low.
it's leagues better than the original suspension for fast road use but i'm not going to lie, it's firm. however, it's far from unbearable and i've probably done about 20,000 miles since i had the suspension kit fitted from rob. going over tall speed bumps IS an issue though and i usually have to crawl over them to save scraping the centre exhaust box. most speed bumps are fine but the tall short ones can be an issue, especially if you have passengers in the car.
given the choice i would PROBABLY go for 40/40, however, i got the 60/60 at a very good price thanks to rob (£250 inc. fitting if i remember correctly!) so just couldn't turn it down.
don't let that put you off though, the 60/60 is a kit i've thoroughly enjoyed having on the E21 and certainly wouldn't revert to the original set up again.
Ross.