frassettor what is your actual draw length with the Widow? That's good for us to know. I assume that you shoot your Widow with a straight bow arm. If you intend to shoot the Hill with a bent elbow like Howard did, you will probably lose 1-2" in actual draw length. If you draw a true 28" with your current bow a 64" will be quite a bit too short for you.
I've read about several different ways to determine bow length, but for the life of me I can't remember where. I think they go like this. Somebody correct me if I'm wrong.
One formula considers the shooter's actual height and subtracts 1" to determine bow length. I'm 5'5" (65") tall, so by that method I should shoot a 64" (which I do). Another formula uses the last digit in the shooter's actual draw length (in my case 25") and adds 60 inches to determine bow length. In this case I would shoot a 65" (which I also do).
I have shot 64s, 65s and 66s equally well. For me the 65" is a nice compromise. Compact and stable. If I was to have a bow built for me today it would be 65". That said I love my 64" bows.
If you are shooting around 28" draw I would definitely go with a 68" or 69". Like Ben said you'll get much more appreciation out of a Hill-style with the longer bow length. A 64" will probably stack on you and leave you asking why people shoot these Hill bows.
I'm pretty sure those Surewoods you have are too stiff for a 60@28. A lot of guys shoot woodies about 10# heavier than required on Hills, but I currently shoot carbons so I can't really comment anymore on that. 25-30# has got to be to stiff though.
Hill-style longbows are not centershot bows. They are typically cut about 3/16" before center.
Additionally, Several things you should consider at some point are grip size, grip shape and limb profile.
Good luck with figuring this stuff out. Great people over here with more Hill info than you can imagine. Keep asking questions. You'll learn a lot and hopefully start with a Hill that fits you. There's nothing worse than ordering a custom anything and finding it doesn't fit you properly.