Honestly, you young uns. No sense of adventure.

Power hacksaws are slow working machines. Any wear and tear is likely to be easily sortable, and probably fairly simple things like bushes etc. Rigidity wise, the construction of them will usually put the best of the horizontal bandsaws to shame. Saying that though, I know someone who fairly recently rebuilt a horizontal bandsaw, (it was literally a box of bits when he got it), and fettled and modified it whilst doing so, and that machine works a treat and is still cutting reliably and perfectly square.
Time is likely the motivating factor in the purchase. If this is something which needs to be just bought and working, with no time for tweaking or restoring, then buying a new heavy duty horizontal is the way to go. If it's something which the OP wants to spend some time on and know that it'll still be running fine years from now though, the old hacksaws are likely the best bet. The simple fact there's still so many of them around testifies to their ruggedness.
We're quite spoilt over here on the old hacksaw front. We had the Likes of the Rapidor, Qualter's, Wicksteed's etc., so plenty to choose from, and many are still in daily use.