Double check your witholding...that tax number seems a bit high. Obviously, YMMV, but I live in MD, which isn't known for low taxes, and I make a similar salary, but have $1200 taken out.
Since your income is in the low 100's, there might be some tax savings opportunities depending on your final AGI. I'd move my contributions from the Roth into savings (or at least not max out my contributions) to give myself room to "lower" my income as needed, but that will require some math. For example, the child tax credit is reduced by 5% for every 1000 of income over $110,000. So if your final AGI is $120,040, it would make sense to put $41 into a traditional IRA to lower that to the next $1,000 level to get an immediate $50 credit. And for each $1,000 you put into a traditional IRA or 401(k), you get an immediate 5% return until you get down to the $110,000 level, you might consider it worth it to put more into the tax deferred vehicles. Now that assumes you have 1 kid...I have 4, so it's an instant 20% return for me, so I definately put enough into a tax deferred account each year to get me down to $110,000.
