Lots of brands of sub-compact tractors out there--Kubota, John Deere, Kyoti, Mahindra, etc.
They're all double or triple the price of the typical top-of-the-line vertical shaft gas engine tractors.
Hit as many of those dealers as you can, take a look at their tractors, and see what model they recommend. Sticker shock won't be so bad after the first visit.
IIRC, the 129 sold for about $1100 new. Get ready to lay out about ten times that if you go with a new one.
My advice to you: ANYTHING but a Scrub Cadet!
Ten times? What Cub models are you referring to? The most expensive I found on their website is the Enduro XT3 series...around 5-6k or so the way it appears. LOL about the sticker shock!
Finding a "one size fits all" mower/tractor is going to require quite a bit of research. I have a Kubota B2910 for my heavy work...logging, brush hog, digging, snow removal, etc., etc. It has served me well for 12+ years, and is a Great small tractor. For mowing I have a Husqvarna 24Hp 48Inch deck. It does a superb job of mowing over 1.5 acres with lots of trees in the yard. I think some of the smaller Kubotas with a removable mower deck Might be your best choice if you want to try one unit that will do almost anything. There is a good reason why Kubota outsells every other brand in this range.
It has been suggested to me by the local Kubota dealer that I should consider the GR2020 - has a 20 HP Kohler engine (I'm curious as to which one - have to check on that) that would also come with a 48" front blade and 48" mower deck. I really don't think I need a sub-compact, nor a model with a front-end loader. Not being familiar with any Kubota models other than my brief perusal on the website, I'll have to look at this GR2020 and see what I think. I'm still weighing all this against the option of just putting a rebuilt Kohler 301 in my 129 Cub, since I know that tractor like the back of my hand, know the quality and longevity it has shown, etc. The rebuild, with labor, would probably be in the neighborhood of $1k, give or take. This GR2020 recommendation came with a quote of a bit over $9k. Tough decision, and one that can't be made anyway until a bit more troubleshooting is done on my Cub to determine if indeed it should have a new engine.
I'm not familiar with the GR 2020, but I looked it up and it is just a good sturdy lawn tractor. However, at $9k, it seems a bit pricey if all you want to do is mow the yard, and do some occasional blading. I agree that the new Cub Cadets aren't the same as some of the older models. I have a couple of neighbors who have newer CC's, and they both have problems with throwing the deck belt. You might want to check out the Husqvarna mowers....mine is doing real good after 2 years, and I only paid $2k at Lowe's. Even if you went for the top of the line Husq, with attachments, you would still be way below half of what your GR quote was. If your Cub is still in good shape..no rust, etc., you might be money ahead to just put a good engine in it, and keep it.
I'd have to agree with ILENGINE recommending upgrading to a subcompact tractor. My Kubota BX2230 has a 3-point hitch, so many implements will work with it. With a garden tractor, you're stuck with that manufactures implements. True, they are more money new, but the only thing I've replaced on my BX2230 is the battery.
I looked at a Cub Cadet subcompact tractor powered by a Daihatsu diesel (the price of the Cub vs the Kubota were almost the exact same and the Cub had plastic fenders and hood), but went with the Kubota, as the Kubota dealer is right down the road from me. Glad I did as Kubota makes great stuff.
The other issue is after Googling images of a Cub Cadet 129, that is an old tractor with possibly an all cast iron engine,,,you won't get nearly the years of service with a new garden tractor, as you got with the 129.
Regards
Jeff