Much of the old fashioned screamo genre has departed and has morphed in with the beautiful sound of post-hardcore metal/rock. Post-hardcore can be defined as rock and metal music that contains extra additives such as synthesizers, electronic elements, odd instruments, loops, and extra instruments that many would not see in a regular rock band. This list will contain the top 5 modern post-hardcore acts in my opinion. Some people may disagree with my analysis, and if you disagree and feel that another band should be added, comment respectfully in the box below.
5. Enter Shikari (2003-present)
I don't know if you could listen to a much corkier sound than the UK phenomenon post-hardcore band, Enter Shikari. It is guaranteed that no two songs sound exactly the same. Their first and greatest album, Take to the Skies (2007), was a great success, combining techno, trance, and dance elements with hard rock and screamo. Their sophmore album Common Dreads (2009) was a dissapointment in my opinion, but they have bounced back with their newest album, A Flash Flood of Colour (2012). Their newest album combines newer electronic elements such as dubstep and drum + bass to their hardcore style to make the album completely their own. If you like experimenting with different styles, then this band is one you must have in your playlist.
4. Abandon All Ships (2006-present)
Canadian band Abandon All Ships is one of the most underrated post-hardcore trance rock bands out there. Their first and latest album, Geeving (2010) is a masterpiece and has a perfect blend of techno, electronic elements, and hard guitar riffs, with singing and screaming being shared 50/50. The song "Take One Last Breath" is epic, catchy, and is perfect if you are into trance rock. Their next highly anticipated album will be coming out in Spring/Summer, 2012 and if they continue with their latest sound, I feel it will be just as epic.
3. I See Stars (2006-present)
No one can deny I See Stars deserving to be on this list. Their newest album Digital Renegade (2012) came out this year and their sound is better than ever. This band improves with each album and this time, they got the mix of techno, screamo, and hard rock better than any other band. If you thought 2010 hit "End of the World Party" was good, that song is nothing compared to the songs on this new album, including my favorite, lead single, "NZT48."
2. D.R.U.G.S. (2010-present)
What do you get when you put the lead singers of Chiodos and From First to Last, the drummer from Matchbook Romance, and the guitarist of Underminded in a band together? You get D.R.U.G.S. This superband has only released one album (self titled), which was mindblowingly good. The song "If You Think This Song Is About You, It Probably Is" is a great opening and there are many other prospects that make me think this band is going somewhere.
1. A Day to Remember (2003-present)
There is no band more deserving of the number one spot than A Day to Remember. Their two latest albums Homesick (2009) and What Separates Me From You (2010) both have songs that you would be singing for days. Not only that, but this band sounds extremely good live. My person recommended songs are "All I Want," "The Downfall of Us All," and "You Be Tails, I'll Be Sonic." But it does not matter what song you choose to listen to; they are all good.

Comments
A Day To Remember as the 'best' in modern post-hardcore? Its chuggy Victory-esque metal with an unhealthy portion of New Found Glory pop-punk, at best.
Modern post-hardcore is a bigger genre that encompasses more bands than many people think. The chuggy metal combined with clean choruses is what puts it into the category of post-hardcore. Though it does not have electronic tendencies like many other, it is a post-hardcore band in the broadest sense.