I'd definitely build your savings rather than paying off an installment debt.
Surprisingly enough, paying off an installment acct. can actually cause your scores to drop.
Mine did when I paid of 2 car notes.
Creditor's like to see a mix of credit instruments: cc's, installment notes, mortgages, etc. If you look at the pie chart under "Credit Education" at the top, you can see where credit mix, accounts for 10% for your FICO score.