SPD
cause thats the first English Version of Power Ranger I've watched
and it turn me into a HUGE RANGER FAN!!!!!

The first 4 because they were linked unlike the later series where it is completely different.
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WAKE UP FEVER!

In the Castle of the Demon World...An Enemy Awaits...Kivat! Lets Go!

Hey, I'm glad you're now a ranger fan, but in my opinion, S.P.D. brings shame to the series. I shudder everytime I remember that season airing. Time Force was the most serious and well done in my opinion. But, if S.P.D. got you to start watching PR, whatever floats your boat.

I WAS a major PR fan until I found Super Sentai and I realized that Disney shamed the Super Sentai Spirit by killing Sentai with horrific voice over in battles, stupid stories and later on making Asians look stupid (PROO & PRJF). No offence to you major PR fans, it's just a personal issue I deal everytime I hear/see Power Rangers.
Anyways sry for going kinda off topic, my fav (believe it or not) was MMPR because it had Adam Park. Who is played by my favourite actor Johnny Yong Bosch. Also I liked PR In Space because, guess what? Yup Adam returned and "morphed" *shiver* into the Black ranger, and nearly killed him. Cool.

I love power rangers S.P.D!