Wort chiller question

So I am looking into building a wort chiller as the first step of starting to build up to all grain.

I think about using 20' of 3/8 copper tubing since i can build it all for under $35 right now. I know that won't be as efficient as some longer chillers, but I figure I could do this for now, since my current brew kettle is 3 gallons.

When I upgrade my kettle, I figure I can use this a pre-chiller with a bigger one.

Or should I just save my pennies and build larger one?

FWIW, I use a 20-25' 3/8" copper tubing immersion chiller and have for over 15 years. I've used it in a 5 gallon brew pot and an 11 gallon turkey fryer. We have cold ground water here, especially in the winter, and I typically go from boiling to ~63F in under 10 minutes with the exception of when I do a hop stand for 30 minutes. Lately I've been cooling 5.5 gallons of finished wort with a hop spider dangling in the middle and because of the really cold ground water I've been getting there in under 10 minutes.

Cool, thanks

One trick, spread the coils to maximize wort contact. You'll be chilling in record time.

Thanks for the heads up