You can get a 95 or 96 model for no higher than P350k siguro. Save mo yung remainder ng budget to upgrade the suspension because I'm sure you'll find the stock suspension very harsh.
You would want to upgrade your suspensions in order to put bigger and meaner tires. Branded names like Old Man Emu or Ironman would give you at least 1.5 inches of lift and if you are mechanically equipt, they could give in more lifts. Suspension modifications cost around P30-40K. Then, put in tire sizes around 29 or 30 inches that are cost efficient.
I don't see anything wrong with the Vitara's interior. I like its boxy and "toy-like" layout. Well, there was a dashboard and interior change for the 2000 model releases.