As you're a student, so I suggest you buy Suzuki Mehran in your budget, the first benefit will be that you'll get a newer model, and secondly, it will also be easy on your pocket maintenance-wise as well as spare parts availability and pricing.
Bike, however, for a trip of around 80 kms is not a good decision if you're already fed-up with the experience of Hiace and using the bike as a daily commute will be a more tiresome experience for you altogether.
The rest is your personal choice.
I hope it helps.