My all time favorite brake levers for swept bars are the Tektro FL540. Riv used to sell them in all silver as Tektro Mountain Levers, though I know now why since they use a road cable instead of a MTB cable. Unfortunately, Riv no longer carries them (Grant, are you listening), but thankfully they are still available on the web as Tektro FL540, though I've never seen them in all silver. Closest is silver & black, as can be seen on my wifes Linus. They are relatively inexpensive at around $25. The graceful shape of the lever appeals to my aesthetics and my hand. I picked up a spare pair this week on eBay, just to have a spare set.