The prices you quoted seem to indicate you have been looking at the integrated route. Do remember that you will save yourself probably half that if you go down the modular route.
With regard to paying off the loan, I really think it depends on your circumstances. Having a family to support and a mortgage to pay may prove a struggle, however, being a single man/woman without any of those responsibilites wouldn't be so much of a problem. Mind you on saying that, I think I will have to get another job soon to cover my loan

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All the best with what you decide.
I noticed you are learning on the Terrahawk, have you stalled or spun it yet?