Chillout, I was just being realistic. Yes I'm 19 and a part of a very well known Photography Firm, meaning I earn well enough (MashAllah) to spend on my car and my equipment, no hard feelings here.
Okay so if the car is well maintained, then just giving the current engine a good day of care will do your job and you can save the money on the swap and spend in the current engine, D-series are made to last, 150k is nothing unless the engine was abused and has damaged internals.
If you go for a swap at the end of the day, then take into consideration these engines:
Turbocharging any engine from the Honda line up will be a pain if your car is a daily runner, since Turbo engines require more maintenance as there is more wear and tear occurring, you'll need very frequent Oil/Oil Filter changes and then the problems that come with a Turbo Charged swap, the list is endless, better stay away.
Do a D-series swap and for any performance add-ons, take a look at Spoon's post # 21