New guitar <3

Somewhere in april I'll be replacing my old guitar (well, old, less than a year old xD) with one of these. And any people who know info that could help, please advise me. I want to buy the right thing.

My old one is a GRG170DX:

http://www.musicstore.com/nl_NL/NLG/Ibanez-GRG170DX-Black-Night-/art-GIT0005533-001



It only has a whammy that can go down, what annoys me, but what annoys me even MORE is that it gets the guitar out of tune because it has no tuning lock. The two things the next 2 guitars DO have.

The first one is the RG370DX:

http://www.musicstore.com/nl_NL/NLG/Ibanez-RG370DX-Black-/art-GIT0004751-001



It's almost the same in design, except has an Edge Zero II Tremolo (MusicStore says Edge III Bridge, is this something else, another part?) and a lock for the tuning. The price is 411,- euro but I think it's worth it.

The second one is the GRG270B:

http://www.musicstore.com/nl_NL/NLG/Ibanez-GRG270B-Black-Night-/art-GIT0006897-001



Is is more simplistic in design and the price is a lot lower (279,- euro), and it also has an Edge III and a tuning lock.

So, if somebody cab help me choose, maybe owns one of the above 2 guitars, please share your info.

Also, a point of importance is that I prefer Ibanez here, BUT it you know any other guitar brand with a Floyd Rose lookalike and a tuning lock and has a metal design like these, let me know.. Also I don't really want to exceed 500 euro.

Thanks in advance ^^

EDIT: I wrote this part in another document so some things repeat

There aren't a lot of differences between the RG370DX and the GRG270B in general. The major difference that I'm concerned about is that the RG370DX has an Edge Zero II Tremolo and the GRG270B had an Edge III, and I need some experience reviews of which one is better. Of the difference is small, I will go for the cheaper one, the GRG270B.

The next difference is also about the tremolo, and that is that the RG370DX has a Zero Point System (the site says that "the strings will stay in tune is one breaks") and the GRG270B doesn't have one. But assuming my scenario at this moment (the E string breaks once in 3 months) I won't be needing this.

The next difference I noticed is that, despite the fact both guitars have an H-S-H configuration of the pickups, the pickups are different. The RG370DX has these: INF3, INFS3 and an INF4 and the GRG270B has PSND1, PSNDS and PSND2. Is there any major difference between these?

Also, I noticed that the RG370DX has a removable stop bar that allows you to switch to floating mode. What is this exactly o.o?

There are lots of minor differnces in sizes and design, but the tremolo concerns me the most.