Here's my prediction:
Not too much will happen before November. Regardless of whether the tax cuts are kept in part or in total, or not kept at all, it won't affect too much growth. All the growth that the Bush Tax Cuts had to give was used up when they were implemented.
In November, Republicans will keep the House, get the White House with Romney, and get more than 49 seats but less than 60.
During the first year, Republicans will work on trying to convert Democrats to getting rid of Obamacare. They'll probably try throwing in deals similar to what Republicans called the Cornhusker Kickback and Louisiana Purchase. If that works, they'll replace it with things like tort reform and allowing health insurance to be sold across state lines. If that doesn't work, they'll just gut it with reconciliation.
Republicans will then continue to use the reconciliation process against any of their opponents who weren't willing to work on their behalf for getting rid of Obamacare. There's all kinds of stuff they'll be able to remove from specific states when they take a machete to the budget. There's a reason that people were calling reconciliation the nuclear option, and it's been invoked.
Although a number of public jobs will go down the drain, things will start picking up when the private sector is unleashed (unless the big business in their question has a Democrat in their pocket and has already gotten an exemption). Unemployment will decrease rapidly during the first two years and even out to something reasonable (I'm guessing 5% but figure I'll be off by a point or two depending on other factors) by 2016. Democrats will try to claim that it would have happened even faster if not for Republican obstructionism, but I don't think people who aren't Democrat will believe it.
We'll see if I'm correct.