The chance that you can pay for a new home in cash is slim. Carefully consider how much you can afford to put down and how much loan you can carry. The more you put down, the less you'll owe and the less you'll pay in interest over time.

Although it may seem logical to plunk down every available dime to cut your interest payments, it's not always the best move. You need to consider other issues, such as your need for cash reserves and what your investments are earning.

Also, don't pour all your cash into a home if you have other debt. Mortgages tend to have lower interest rates than other debt, and you may deduct the interest you pay on the first $1 million of a mortgage loan. (If your mortgage has a high rate, you can always refinance later if rates fall. Use our calculator to determine how much you might save.)

A 20 percent down payment is traditional and may help buyers get the best mortgage deals. Many homebuyers do put down less - as little as 3 percent in some cases. But if you do, you'll end up paying higher monthly mortgage bills because you're borrowing more money, and you will have to pay for primary mortgage insurance (PMI), which protects the lender in the event you default.

When it comes to paying for your children's education, allowing your kids to take loans makes far more sense than liquidating or borrowing against your retirement fund. That's because your kids have plenty of financial sources to draw on for college, but no one is going to give you a scholarship for your retirement. What's more, a big 401(k) balance won't count against you if you apply for financial aid since retirement savings are not counted as available assets.

It's also unwise to borrow against your home to cover tuition. If you run into financial difficulties down the road, you risk losing the house.

Your best bet is to save what you can for your kids' educations without compromising your own financial health. Then let your kids borrow what you can't provide, especially if they are eligible for a government-backed Perkins or Stafford loans, which are based on need. Such loans have guaranteed low rates; no interest payments are due until after graduation; and interest paid is tax-deductible under certain circumstances.

Figuring out the best way to finance a car depends on how long you plan to keep it, since a car's value plummets as soon as you drive it off the lot. It also depends on how much cash you have on hand.

If you can pay for the car outright, it makes sense to do so if you plan to keep the car until it dies or for longer than the term of a high-interest car loan or pricey lease. It's also smart to use cash if that money is unlikely to earn more invested than what you would pay in loan interest.

Most people, however, can't afford to put down 100 percent. So the goal is to put down as much as possible without jeopardizing your other financial goals and emergency fund. Typically, you won't be able to get a car loan without putting down at least 10 percent. A loan makes most sense if you want to buy a new car and plan to keep driving it long after your loan payments have stopped.

You may be tempted to use a home equity loan when buying a car because you're likely to get a lower interest rate than you would on an auto loan, and the interest is tax-deductible. But before going this route make sure you can afford the payments. If you default, you could lose your home. And be sure you can pay it off while you still have the car since it's painful to pay for something that has been consigned to the junkyard.

Leasing a car might be your best bet if the following applies: you want a new car every three or four years; you want to avoid a down payment of 10 percent to 20 percent; you don't drive more than the 15,000 miles a year allowed in most leases; and you keep your vehicle in good condition so that you avoid end-of-lease penalties.

Whatever route you choose, shop for the best deals. Remember, it's in the car dealer's best interest to finance at the highest rate possible, so look at what you'll pay overall, not just the monthly amount. If you tell your car dealer you can spend $400 a month, you could end up with a new car for $400 a month based on an uncompetitive interest rate.