One question I have to ask though. The specs for cap C6 are 1 uF 50V, the closest I could find at the local electronic store (RadioShack) is 1 uF 35V, I was wondering if there could be a problem of premature failure under stress. I had a C6 at 1 uF 35V on a different board run fine for several years but I wanted to ask.

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You always want to find a capacitor with a higher voltage rating than the original cap in order to compensate for fluctuations in the power supply (i.e., surges, etc.). I learned this when the capacitors were being replaced on my Plus. A capacitor with a lower voltage rating will not be able to tolerate the stress of the power supply, so try to find one with a higher voltage rating. Furthermore, I would recommend finding a capacitor made by General Electric (or any well-known brand; avoid anything made exclusively by RadioShack). They are very reliable, and will save you from having to repair the Mac again.