An unsecured loan is 10% interest minimum. It's throwing money in the bin.
If you can afford to pay it off along side a mortgage, that's how much you can afford to save a month.
Let's say a 400k house. 5% deposit of 20k. The monthly repayments on $380k over 30 years at 5% interest are about $2040. Repayments for the 8k personal loan over 5 years at 10% are about $170 a month. Total interest on that personal loan is $2200.
If you save your money at the rate of mortgage plus personal loan repayment, say $2200 a month,it will only take you 3.6 months to save up the 8k needed to avoid the personal loan.
So your choices are, wait 3.6 months or burn $2200. I'd be waiting.
I've probably got something wrong in there somewhere though, so check my work.
Edit: Not to mention the effect of having an extra $170 /month in hand for five years. If you put that money towards your mortgage instead you will save a boatload. I'll figure it out, brb.
Edit 2: Ok, its a bit hard to find a calculator that will let you put in an extra repayment for a little while and then stop, and I'm not busting out the spreadsheets just yet. But, if you if put in an extra $170/month for the life of the loan, you save $62000 interest and pay it off 4 and a bit years sooner. Or, if you save that $170/month for 5 years and put the $10200 lump sum into your account (which assumes 0 interest on the money) after five years, you save $24000 in interest and 16 months off your mortgage.