I have 46 acres and a 52 HP Long LongTrac, new in 2002.
It has a 3 cylinder diesel and the implements it can handle are 7 foot or smaller. It takes me four 6 hour days to cut and 5 days to disk with my six foot RC/6' disk. I do love that Longtrac, it was $12,900 (no longer in US as new sales) I would gladly trade it for a old junker 100 HP. It's way to small to hay with and after 6 or 7 hours and no end in sight I get a little short tempered and hit the go fast. On my hilly land with rutts, that's not good.
I would look for a CASE IH 886 or bigger you can find these in good shape for 12.5K. They are 80HP (I think) and the 1086 is 120HP. Restored 1086 is available at 15.75K.
Don't get too small, see the other thread about a guy want to trade up, no takers (dealer) can he find for his recent purchase.