you want an xbox or xbox 360 modded?
xbox (original ) - is great for roms/emulators ( old school games ) and since live has been discontinued for it who cares...also media center kicks ass
xbox 360 - the way to go is JTAG...but it requires a certain 360 manufactured before a certain date..i think it was 2006 was the last year for JTAG
you can flash your dvd drive on all 360 model's ( not sure about the newest slim build )
the newer the box the more it may cost, different security measures were added to prevent flashing on newer 2009 and up boxes...it can still be done just takes a little longer....make sure you flash the drive with the latest and greatest which would be xtreme LT....you will eventually get banned from live if you ever connect to it...hasnt happened to me yet....over a year with the flash...i dont play online though...i do go and buy DLC off the silver live membership...so far so good
finding the games can be easy...however make sure you have at least 16 gigs of hard drive available for unzipping the iso file... the game may be 6-7 gigs but when unzipped it doubles
also you will need DUAL LAYER DVD BURNER they arent too bad on price around 40-60 bucks....i have a external burner cost me 40 at frys electronics
the DVD's to burn the games cost though....its like 40 for 25 discs
i only use VERBATIM DVD+R DUAL LAYER DISCS.....ive had issues with other brands such as freezing and skipping...but like i said they cost a little more...but well worth it
next you will need an xbox 360 game burning program....
most people use IMG BURN and ABGX this is complicated for a beginner....i had so many issues with setting up it was a nightmare...xbox games have to be set at a specific data zone of 1,913,760 ...this is the 360 standard.....again it gets worse
i use a program that is simple and user friendly called COOKIES GAME BURNER...and it gets no easier...simply insert disc add your xbox 360 ISO game file...SET BURN SPEED TO 2X and click burn....in about 30 minutes your playing
I CANT STRESS ENOUGH THAT YOU BURN GAMES AT 2x SPEED it works....
ALSO...if you plan on just getting the flash and paying for the burned games make sure they are on a quality dvd such as VERBATIM DVD+DL disc and that has been verified before purchase