This is what my 750 ACE came with from one of the previous owners and I've kept them.

P4003 Paladin® Highway Bars for Honda® VT750CD Shadow A.C.E. Deluxe

Paladin® Highway Bars are perfect for clamp-on highway pegs. And, in the event of a bike tip-over, they may help protect the bike's finish and components.

www.nationalcycle.com

They don't drag in the corner which is kind of important for me as a "crash bar" that does is going to cause a crash.
The pegs will scrape first to give you warning with these.
I don't particularly like the look of crash/engine/highway bars, but dammit when the bike flops over and you add up what was just saved, they're kinda nice.
Crash bars often conflict with forward controls so that might be something to think about.

 

Crash bar is a great place to mount highway pegs! For long distance highway pegs are a must! Foot boards too! If branded the same and made for your bike they will bolt up and work together. I happen to like the look of a crash bar. And it will save your tank and signals in a slow speed crash or drop.

 

look on eBay, i just picked up a set of big bike parts for my Sabre brand new in the box for less than a $100.00
Waiting on delivery now!

 

There is one "engine guard" out there that uses the well nut that mounts the top of the radiator. I'd stay away from those, I can see needing a new radiator after a tip-over with that type...