It is difficult to know whether the X350.5 or the XA60.5 would be better for you. It depends upon the size of your room, the music you like, and the loudness level. For example, classical music requires alot of power to avoid becoming congested and strained.
There is no doubt the XA.5 is better than the X.5, by a huge margin. However, you may need to consider the XA100.5 (or even the XA160.5) for the 86db load into 4 ohms.
Personally, I would be skeptical that the XA60.5 would do the job. You can arrange a demo from Reno Hifi if you first want to try. Ideally, the XA160.5 would probably be the pick.
There is no doubt the XA.5 is better than the X.5, by a huge margin. However, you may need to consider the XA100.5 (or even the XA160.5) for the 86db load into 4 ohms.
Personally, I would be skeptical that the XA60.5 would do the job. You can arrange a demo from Reno Hifi if you first want to try. Ideally, the XA160.5 would probably be the pick.