Wufoo are famously good, and Kevin does all of that work. SocialMoth/Overhear.us have awesome design and Evan does everything. iminlikewithyou.com is tasty (if a bit overly pretty), and I believe they do it in-house, as well. Reddit is great and clean, and Alexis and Steve designed it.
Everyone is swayed by a nice clean design, even technically savvy folks like YC (they also know that a good design can make a good product great, and with bad design the best product will probably fail--MySpace being an obvious and baffling exception to that rule).
Given what they claim to do, who frequents news.yc, the fact that this is your only comment (or post) and how out of context this recommendation seems to be, you're setting off some serious spam flags. Assuming you deserve the benefit of the doubt : Care to clarify or point us to their web design wing?
Their web site looks nice, but they seem expensive!!! What's "Low Cost" to you? Ballpark figure? I know some companies charge thousands of dollars, and that's beyond my budget.