u can for sure

the reason why the bank recommends yah to buy is cos that the current tax bracket for you guys is low based on ur income, so ROTH IRA couldnt be taxable. but you can use the ROTH IRA for investment on mutual fund or some what you will earn later( P+EARNINGS) wont need to be paid tax when u take them out after you retire. so normally for those couples with lower income , roth seems much better than regular IRA. n u can max. contribute up to 4k per yr. so i dont really see any big issue for u two to put 4k as retirement plan for earning money w/o paying tax:-) just do that