Highest interest rates? What would you do? Please help?

Myself and my partner are looking at purchasing our first home we both earn rather high incomes for our age nd are looking at buying a home that is marked at $349,000, we can afford the interest rates at present and if they go up also but we are curious as to what is the highest they have been in the last few years (for example when they were really high) so we can budget for this and be sure we wont default etc and can still make the minimum repayment.? Please help?