Both Margalla and baleno are hard to find in pristine condition because most of the margallas have body rusting issues while the baleno being abused due to its missing problems mostly.
Margalla is cheaper and easier to maintain as compared to baleno because parts availability is an issue for baleno (mostly interior, exterior and mechanical).
In your budget, buy a cheap margalla with good frame and mechanicals. Go to markets like shershah in KHI or Bilal gunj in lahore, make deal for all 4 door, bonette, diggi, fenders of imported model and get the car completed.
3-4 months back i visited shershah market, i found many guys keeping complete parts of margalla imported one.
I took estimate of complete imported parts which was like this 75000/- it includes.
02 front fenders with indicators
bonette
diggi with show
all four doors with all the door rubbers, weather strips, door cards everything intact
02 bumpers