Roth 401k vs. Early Mortgage Payoff

[mikeyhos]

Here is my info. My wife and I have a combined income of 70,000 dollars a year.
We bought our condo in 2008 for 163,000. We put 30,000 down. So, our original loan in 2008 was $130,450.00 with a 15 year mortgage at 5.625%.
As of September 2011, we have paid the loan down to $108,684.52.
We were contributing 400.00 each to our separate roth 401k retirement accounts.
We currently have a savings of 21,000 in the bank.
Right now we both have about 12,000 each in our separate 401k accounts.
We were thinking of dropping our roth 401k deposits to 50.00 each and increasing our mortgage payments by 2,000 or 2,500 a month to pay it off in roughly 4 years.
Is this plan smart, or is there something else you suggest.

Additional info:
My wife and I are both teachers and live in North Carolina. We currently do not have kids. I am 31 and my wife is 30 years old.
Any info would be greatly appreciated! Thank you.

Additional Details

Our home value has dropped from 163,000 to 130,000. There are new units in my building going for 130k that have not yet been sold. So, selling in the next coulple of years would be out of the question. SO....we thought about renting it out. If we rent it out, we can get just under 900 a month. Should we refinance and pay the min monthly(or maybe a little more) as we save and buy a larger home for future kids? (we are trying now) The rent would pay that mortgage. We thought about even living with parents for 6 months to help save more of a down payment and extra cushion. This might allow us to have that extra security of a lower monthly payment (if needed) and try to still pay more per month? So I guess, refi would let us move out....renter pay most of the mortgage per month and possibly buy another home. ...and then try to sell the condo as soon as our neighborhood picks up. What do you think?

[LCDMAN]

This is a UK site - not sure why you think we can help?

Maybe Clannad can - he's American...