Just to further this entertaining subject -- in my opinion, two of the better choices in the 60 class are two of the low-end price leaders -- the TT 61 GP & the OS 65 LA.

Both make essentially as much real-world power as their in-house "high output" brothers" (TT 61 Pro & OS 61 FX) at quite a bit lower cost. Definately way more bang-for-the-buck. Neither the TT 61 Pro, nor the OS .61 FX are startling performers -- pretty much the same as most 60 size engines.

As a general arguing point, I have never encountered any 60-size engine that I thought was a great powerhouse -- too much bulk & weight, & not enough go for me. I prefer the 75 size engines -- same size & weight & a fair bit more snap, for very close to the price of the 60's (MDS 78 excepted).