I own a K2 and a DR-200 and I don't worry about parts as much as most people seem to. I still shoot both, though since the end of the ban, the DR-200 with the ACE folder has seen more action lately. The parts issue is something to consider, but it's not an automatic "reject" for me.
There are several Daewoo rifles:
K1A1, Max I, and AR-110C are all the same rifle imported by different people. It uses an AR-15 type gas system, and has the wire collapsing stock.
K2, Max II, and AR 100 are all the same rifle imported by different people. It uses an AK type gas system, gas regulator, and has a solid, side folding stock. Barrel twist is 1/7.
The DR-200 is the post-ban version of the K2. Barrel twist is 1/12.
The DR-300 is a DR-200 that is chambered in 7.62x39 and uses the AR-15 mags for the 7.62x39 AR.
There are fewer K1A1's in the US, and prices tend to be a couple hundred higher than a K2. You rarely see the DR-300, so collecting wise, those two are the best bets.
I personally think the K2 is a better rifle than the M16A1 it replaced in the ROK Army. The ROK was already making M16's under license, when they went looking for a new rifle. The wanted one that could fold up smaller than the M16 (which has the buffer tube, so it will never be smaller than a true folder can), was as reliable as an AK, but still as accurate and light as an M16. Pretty interesting requirements that were met by the K2. If you think about all the up roar over AR piston uppers, etc. you'll realize that the Koreans had it figured out and in production decades ago.
The rifle doesn't have all the accesory support that the AR does. It's not void of them though. It does take the M16A1 bipod and bayonet, and also both FAL and HK-91 handguards can be modified to fit. so you can have rails if that's what you're into.
The fire control parts are replaceable with AR-15 parts. They drop right in. You can't mix AR and Daewoo FCG parts though supposedly. Stick to one or the other. Most of the parts that aren't AR compatible in some way are IMO improvments. The ejector is not the spring loaded one on the AR, but a solid piece of steel like on an AK. Unlike the AK's the Daewoo ejector is actually easy to replace if damaged. The problem being, of course, finding an ejector to replace it with. You'd probably have to make one, though it's a simple straight piece of steel, so it shouldn't be too hard. But it's a perfect example of the quandry of owning a DAEWOO.
I like the rifle. I think it's better than most, and equal to the rest. I wish it had parts available, but have to admit that I haven't broken anything yet either. The parts situation doesn't stop me from owning, shooting, or even working the rifle hard, but it is something you need to understand.