The polka one is fantastic — it's absolutely brilliantly edited, it's made with utter nostalgic love for the source material and fandom, and weirdly the humorous song choice does a great job in capturing the blend of humour and heart-wrenching emotion that was the hallmark of the show.

Regarding the Sarah Connor one, just be warned that the download link gave me a 'malicious file' warning, so proceed with caution if you want to download it.