I have a similar problem and have not bought anything yet because of all the pro and con weigh-ins. Most posts, except for those from New Zealand, say a 4 in 1 is not good because it is too heavy and a jack of all trades, master of none. Yet they turn around and say buy a grapple that weighs within about 150lb of the 4 in 1. I don't really get it because if you're operating within 100-200lb of your loader capacity all the time, you may have other problems to deal with. They do say the 4 in 1 comes into its own and is quite useful on a skid steer/track loader, but not on a tractor (because of the power and machine stiffness differences between the two). However, based on the reviews, I decided to fold and I will not buy a 4 in 1. Since I am looking at relatively small acreage use (just a bit bigger than yours), I am leaning toward the Add A Grapple instead of a full blown EA grapple. If you are not running a logging company and only need to move relatively small stuff (e.g. no 500lb tree trunks), the advantage of the Add A Grapple that I see is when you get to the bottom of the pile and small stuff starts dropping through the tines of the full blown grapples (which is even more of a problem with fork mounted grapples). The Add A Grapple lets you use the solid bottom of the bucket to get that small stuff without getting off the tractor or changing implements. So, the solution that I am considering is putting a Piranha or EA tooth bar on the bucket plus the Add A Grapple. The tooth bar will stick out a little bit in front of the stock bucket cutting edge, so it will help grab things that are longer than the width of the bucket. The tooth bar is also supposed to improve the digging capability of your stock bucket, which I think I am going to need because I doubt a 72" straight edged bucket is going to do much of anything in the way of digging without teeth. If you end up buying a full blown grapple, it appears that EA is the one to get, but you will pay double the cost of the Add A Grapple Single and will pay more for the EA even if you get the double A A G - up to you whether the cost/benefit ratio meets your cutoff. ... Just a thought for consideration. Not totally certain what I will do yet.
BC2 for what it's worth I have had a bucket grapple on my 30 hp L3010 for over 20 years and could not be happier for all the reasons you said - light, functional, and always have both the bucket and grapple with me. Also have a tooth bar which made a big difference when I added it.
I spend a lot of time in the woods loading logs and maintaining tractor roads. Have 20 yrs of pics - here are some.
I have to say that it is not as good as a dedicated grapple for holding big loads of brush because of the bucket sides stealing some of the volume but it has no trouble getting the job done. There is still plenty of bite.
Hope this helps
gg