Basically the opposite of this thread, but same concept (rules etc.) is still applied - and as a reminder:
MAX. 4 PICKS PER PERSON/POST AND NO OUTROS ALLOWED (I consider outros to be one form of cheating tbqh)
Also: some people were curious about whether they are allowed to post non-Japanese stuff too - answer is: yes - feel free to post anything, as long as it's a "proper" closer (in your opinion) + make sure to explain briefly why you chose the certain song etc.. Just because we are "J-music based community" doesn't mean that we should be "STRICTLY" limited to "only JP music" policies FFS - so cast your prejudices aside and go-go!
OP's example/picks:
1) Plastic Tree - Circus
La Grande Finale of one of my favorite Pura releases, "Puppet Show" - pretty much showcases their talents and ability in expressing their unique, dreamy imagery through britpop-ish influences (and most britpop-influenced acts don't really showcase their "messages" vividly imho). I also like how it changes its tempo fittingly along the way and gives a nice spotlight for Ryutaro's vocals as I knew them back when I began to know them. Gorgeous song is gorgeous.
2) Dir en grey - Inconvenient Ideal
What would sound like a normal semi-power ballad in the beginning soars beautifully to the immense levels of "wow"-factor til the end - as a Dir stan I found it difficult to find a fitting favorite out of their closers, but "Inconvenient" hands down gave me the same impression today as it did back in November 2008 - pure pleasure. I got to note that I find build-ups during the chorus and climax (along with "300"-y gang chants) really epic and something what you'd memorize even after many years.
3) MUCC - Hanabi
One of those "totally unexpected, but neat" closers - you'd normally put your volume down/skip when you hear opening notes that remind you of those cheesy piano ballads way too much, but...BANG! And there goes almost "festive" part of Mucc's Hanabi. I might be the only one who feels this way, but "Hanabi" feels very "Japanesque" to me but not in stereotypical a la "Kiryu/Kagrra" fashion - perhaps the melody has some folk-ish tinges? That aside - Mucc has many good closers (Zutazuta, Freesia...), but as I noted earlier - the "wow" factor is important to me whether I listen to certain parts of an album, and "wow" here is totally existent - and BIG too.
4) The Dillinger Escape Plan - Mouth of Ghosts
Moody and emotional, almost jazz-ish in parts and immense build-up...here might lie my key recipe to "closers that totally get me in". Sure - the song itself isn't necessarily of what they're doing normally (this sounds more like an unique approach on some late FNM song), but you gotta give kudos to them for total surprise! Might not be your cup of tea, but "one of a kind-ness" is certainly retained in MoG - as I see it.