I've never tried shooting anything other than 7.62 Nagant from mine; from what I've read, it's perfectly safe to shoot .32 SW Long, but you may end up up with bulging or split casings as is commonly reported by people who've done this.
There's some debate about whether it's ok to shoot .32 H&R magnum. Some insist it's too high-pressure a round, although there are also a number of people who have reported firing the round in question from a Nagant without any problems. These people argue that although .32 H&R mag is a higher pressure round than the 7.62 Nagant ammo commercially available today, the original military ammo intended for these pistols when they were in use equals and even exceeds the pressures of the .32 H&R mag. I don't actually know. Oddly enough, it seems locally it's easier (and cheaper for that matter, which is sad) to find 7.62 Nagant than either .32SW Long or .32H&R mag locally, so I've never seen any reason to try.
If the price of 7.62 Nagant is a problem, you may try to get a conversion cylinder that will allow you to shoot .32 acp, which is cheaper and more available than any of the aforementioned calibers.
As far as the gun itself goes, it's an extremely solidly-made gun, extremely reliable. Clearly made to last and function forever. Very heavy but at least smooth DA trigger pull, decent SA trigger, though. Has basically no felt recoil.
$80 is a pretty good price, like most guns, they used to available for less. Of course $80 is face value, you have to take into account the cost of shipping and FFL transfers which will determine your actual cost. My advice would to see if they're available for locally (and for what price), and also see what your local dealers charge for FFL transfers. Some may charge as little as $10 or $15, and others as much as $40, or even more. I bought my Nagant at a local shop for $120. Figured, if I buy online I'll pay $80 for the gun, another $20-something for shipping, and $20 more for FFL transfer, so I may as well support the local shop and also avoid the hassle with faxing FFL's, waiting on shipping, and so on.