If you paid $5000 more than you can get for your tractor, it would be a steal for you. The 5030 cab is worth that much more alone. You would be getting a more expensive tractor, you would be getting a more powerful tractor, you would be getting a much more powerful loader, and you would have a tractor with less hours. I'd venture to guess that if you were to trade (this is assuming I have it right, and you don't have a cab on your 3830) at a dealership that you'd have to pay 10k to 15k in addition to your trade depending on the condition of the tractors. The cheapest I've seen a new L5030HSTC with the 853 loader is in the 30k to 31k range.