In the 18 month maturity CD rate bracket, there are quite a few banks providing high interest rates.

Eloan.com offers 5.36% APY on their 18 month certificate of deposit, with a $5,000 minimum deposit.

Intervest Online‘s 18 month CD yields a 5.35% APY. Minimum deposit for this bank is $2,500, and $1,000 for IRA CDs.

Bank of Internet has a 18 month CD with a 5.37% APY, which is currently the highest rate available. It should be noted, however, that BofI has pretty flexible maturity dates, and a CD with a 17 or below maturity term has a 5.44% APY, which is significantly better.

All three banks or FDIC insured.