I would advise you to go for TDi Engine if Quadrajet is out of your budget.
TDi is Low on Maintenance if taken good care.
As for Turbo getting Busted, follow the below TIPS and your Turbo will last for a lifetime. Thats my promise.
1)Idle the engine for 30 seconds after starting a COLD Engine.
2)Idle the engine for 30 seconds before stopping the engine if you drove really hard (Rpms greater than 2000-2500).
3)Carry out Engine Oil Change at every 10,000kms (I hope TML Recommends at 10,000kms).
My Dad's friend used to own Indica Turbo. The Turbo got busted after some 70,000kms. But this was not without reason. The driver used to Run the car in improper way and the car was not maintained properly.
Our Indigo LS (May 2004) which has covered 1,79,000kms did not face any Turbo problem. The car still gives Amazing Pickup above 2000rpm (The Turbo comes into action after 2000rpms).
I would Definately Recommend you the TDi.