Buying a twin (maybe seneca 2)

[A and C]

PA 34

The PA34-200T is a good workman like twin and has a reasonable range with 4 POB and the performance on one engine is OK for a light twin, the PA34-200 is marganal to say the least on one engine.

If you can afford a Beech Baron that would be a better move in terms of all round performance.

Please remember that ALL light twins have a time between leaving the ground and V2 when they cant continue flying if an engine fails, and even when "cleaned up" flying them on one engine is much more demanding than flying a modern twin engined airliner with only one engine working.

[High Wing Drifter]

Just to add to A and C's comment, the time it takes to go from 65kts (rotate with 25 flap in the Seneca 1 from a grass strip) to 83kts (VTOSS t/o safety speed, sometimes and arguably incorrectly called V2) is agonisingly long. One really has to restrict the climb to accelerate sufficiently quickly or else entertain the possibility of having to put down beyond the runway.

[Fuji Abound]

Engine failure, ECU failure, MFD failure, AHRS failure...the list goes on

You have been very unlucky.

are there any da-42's delivered yet with those new 2.0 engines ?

Yes.

How are they actually delivered with 1.7 or 2.0 ?

All now with the new engines.

You could buy the bottom 4 for the price of a 42:

True, but add in the cost of a couple of zero timed engines - £30K, and mode S - 4K fitted, annual service and fuel costs over a year and the difference is at least half, and having spent the money the aircraft is not worth a lot more than you paid.