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As someone that recently did a 3.6 conversion, I might provide a cautionary tale. If I had to do it all over again, I would have just rebuilt my 2.7 and done some upgrades to it (EFI, bigger displacement). Your original engine (depending on condition) is a viable option and most importantly it is plug and play versus all the conversion bits required for a 3.6. The added complexity of the 3.6 conversion introduces so many variables and thus opportunity for problems/issues/added cost.
I bought an engine that was advertised as rebuilt but in actuality it was not and needed to be rebuilt. Even if you get lucky, do your due diligence and get a decent 3.6 engine, the time and money required to do the conversion can be daunting when all is said and done.
It all depends on what you want. The 3.6 will provide more power out of the box and you can only go up from there with 300+ hp being possible. With my 2.7 I would be luck to get 220hp but honestly, that would have been completely acceptable to me since my car is so light any way. And I would have saved about $15K in the process, plus all the time required for the conversion install and troubleshooting. If I didn't need to rebuild my 3.6, the calculus would have been much different and I probably would feel better about the ROI on the 3.6 conversion.
Basically, if you are going to go down the route of a 3.6, do the best you can to ensure you get a good motor. As someone mentioned earlier, they are expensive and the last thing you want to do is add the cost of a rebuild on top of that. Good luck.
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