IDENTIFY YOUR XBOX MODEL
To pick your hack type best for you firstly see below to see what console model you have and then move to the "HACK INFORMATION" section to see the possible hacks avaliable and summary of each one.
PHAT MODEL XBOX 360 (SLIM BELOW)

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XENON
This is the version 1 xbox 360 from 2005 to some early 2007 and does not have hdmi port as standard but all xbox 360 models can give out HD quality TV regardless of HDMI using a component type lead or an AV to HDMI converter (sold by microsoft)
Hacks = firmware or x360 dock on any dvd drive / jtag if dash under 7371
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ZEPHYR
This is the version 2 xbox 360 from 2007 to 2008 same as the XENON but has the HDMI port fitted (rest is the same).
Hacks = firmware or x360 dock on any dvd drive / jtag if dash under 7371 / reset glitch dash 7371 to 14719 inclusive
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FALCON
This is the version 3 xbox 360 from 2008 to 2009 this has the HDMI port and was the first console to have the new falcon chipset which means it runs at about 20 degrees lower temperature and therefore has a lot less chance of getting RROD or red light errors.
Hacks = firmware or x360 dock on any dvd drive / jtag if dash under 7371 / reset glitch dash 7371 to 14719 inclusive
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JASPER
This is the version 4 xbox 360 from 2009 onwards and had the new jasper CPU snd GPU chips and is almost impossible to get RROD some models have built in memory to store your game profile (64 & 256 & 512 mb) - worth noting though if it does RROD you will then lose you profile - i wouldnt use internal memory if it was me (not very big anyway - but console is good)
Hacks = firmware or x360 dock on any dvd drive / jtag if dash under 7371 / reset glitch dash 7371 to 14719 inclusive
NOTE - ANY DVD DRIVE CAN BE MODDED ON THE XBOX 360 PHATS TO LT+ IXTREME FIRMWARE (LIVE SAFE)
SLIM MODEL XBOX 360
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TRINITY (SLIM)
This is the version 5 xbox 360 from 2010 onwards and has the all new completely redesigned motherboard and is said to be the cure to the RROD and also runs very quietly - CAN BE MODDED WITH FIRMWARE OR RESET GLITCH OR X360 dock (POWER SUPPLY IS A 10 AMP MODEL)
Hacks = firmware or x360 dock on lite on dvd drive / reset glitch dash upto 16203 microsoft dashboard
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CORONA V1,V3 (SLIM 250GB) - 16mb nand - CHECK POWER PACK 9 AMP MODELS MADE IN 2011
This is the version 6 xbox 360 from 2011 onwards and has the all new completely redesigned motherboard
Hacks = firmware or x360 dock on lite on dvd drive / reset glitch dash upto 16203 microsoft dashboard
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CORONA V2,V4(SLIM 4GB) - 4gb nand models - SOME LATE 2011 onwards
This is the version 6 xbox 360 from late 2011 onwards and has the all new completely redesigned motherboard
Hacks = firmware or x360 dock on lite on dvd drive / reset glitch dash upto 16203 microsoft dashboard
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NOTE - ANY LITE ON DVD DRIVE CAN BE MODDED ON THE XBOX 360 SLIMS TO LT+ IXTREME FIRMWARE (LIVE SAFE) BUT WILL REQUIRE AN UNLOCKED PCB BOARD AND FURTHER HACKS THE FIRST TIME AND THIS IS WHY IS COSTS MORE TO DO THE SLIMS FOR THE FIRST TIME.