I think they're all getting V2'd eventually because they're using DVDrips now. The quality in some of the original sources is noticeably bad.

That's another reason as well. The priority is on 1-10 though because those had some issues that the head of GUIS wanted to fix.

I'd go with Gekiranger.

At least, personally. I love Gokaiger too, though sometimes it lags for me in non-tribute episodes later on. Though like Drakkhen has stated, it's not over yet so yeah.

Gokaiger, followed by Shinkenger

In case you missed it last year, TV Asahi aired a Super Sentai 35th Anniversary special before Gokaiger aired. Based on a poll they conducted, here are the top five Heisei era Super Sentai titles:

1. Samurai Sentai Shinkenger (2009)
2. Tokusou Sentai Dekaranger (2004)
3. Kyouryuu Sentai Zyuranger (1992)
4. Ninpuu Sentai Hurricaneger (2002)
5. Engine Sentai Go-onger (2008)

It was obvious that Shinkenger and Dekaranger would dominate this list, as both are immensely popular in Japan. Zyuranger was somewhat of a surprise, as it really wasn't that good. But then again, it gets recognition because it was the basis for Mighty Morphin' Power Rangers. Such a shame that Choujin Sentai Jetman, Gosei Sentai Dairanger, Ninja Sentai Kakuranger Mirai Sentai Timeranger, Hyakujuu Sentai Gaoranger and Jyuken Sentai Gekiranger didn't make the list.

2001-2011 top 3 for me:

1)Shinkenger
2)Dekaranger
3)Boukenger

I know I'll take flack for that last one :lol

Having Gokaiger and Shinkenger in this poll is so unfair to all the other ones.

I voted for Gokaiger, of course.

Although I love Gokaiger, it was Dekaranger that got me back into Super Sentai after over a decade.

Go-kaiger - GOKAI CHANGE!
Shinkenger - I personally think they had the best casting. Also kudos for pulling off the Kanji motif.
Go-onger - Suits are my favorite
Gekiranger - My favorite 3-member team pre-Go-busters. Rio is awesome as a villian.
Dekaranger - Cops + sentai done well
Hurricanger - Shurikenger FTW

This is easy and hard at the same time. Easy because AbaRanger, GekiRanger, and Gokaiger are the only series I feel are even worth mentioning for this era of Sentai, as this era brought us some of the worst Sentai has ever offered (Deka, Go-On, and Gosei). However, it is hard to say which one of the three is superior. GekiRanger has some extremely well done choreography, also the villians like Rio and Mele were complex and highly developed, AbaRanger had incredible moments thanks to AbareKiller and the subplot between Jannu, AbareBlack, and Rije is top notch. While Gokaiger has an excellent ranger cast and shows how to do an anniversary series right, but I'm going to wait until Gokaiger ends before I make my pick here.