You will love the 749. I have a 748 and it's been great.
I doubt it would handle the tiller though. I have a Howard 60" rotovator J and it bogs down my 1910 at times. It is also very heavy. Maybe yours is much smaller.
I went out to the ranch and looked at it today it is larger than I remembered. Doesn't till near as deep as my 673 unit does, so I guess I will be in the market for a 48" tiller right away. Howard does have several models in different duty levels, the one I have is a light duty.
I will be busy this winter in my new shop building up some custom implements for both tractors.