A.S.
We are in the middle of buying an SUV currently. I have researched, polled, asked everything you can imagine. Mini vans are probably your best bet. I just couldn't do it yet. :) Guess i think I am 'too cool'. LOL Anyway, don't let people bully you into thinking badly about getting a larger size vehicle. If you have the need for the space than do it. We travel a lot with extra luggage and want to be in the safest vehicle when driving next to 18 wheelers on the interstate!
Most hybrids don't save you money until owned for about 6 years, they break down easily (like on the interstate for cracked windshields!), and cost a lot to fix with less people knowing how to actually repair.
As far as the gas prices, just take that into consideration. Try not to drive as often as normal, with 3 little kids you won't want to anyway :0)! Do things like only go to the store once a week not every day, drive with windows down more instead of air conditioning, gas up in the mornings, etc.
Blessings,
Amanda