Can't you just check what wget returns for errors? That said, the only way to be sure there was no corruption is using the hash method, I don't think that's too much for even that machine to do to be honest, you can use cksum instead of md5sum if md5sum is too resource intensive. If this is still too resource intensive you can make a small python script that calculates the hash in very small chunks this way your memory usage will be low for sure.
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