I've cosplayed as both Pre/Post Time skip Luffy.
I had alot more fun going as post time skip luffy. That was largely due to the quality of the costumes though. When I tried going as pre Luffy, I tried my hand at sewing/making the shirt my self. Let's just say it came out pretty rough. For my post costume, I stepped things up and and had the shirt commissioned. Everything else was made by me. (Hat/Shorts/etc)
Just my 2 cents for you.
~Sena (Eyeshield 21) - 10% (Trying to figure out where to get a Helmet/Jersey/Pads)
~Natsu? (Fairy Tail) - 25%
~Mid-Valley the Horn Freak (Trigun) - 100%
~Monkey D. Luffy (One Piece) - 100%
~Green Arrow - 100%
~Young Penguin (Batman) - 100%
~Male Jean Gray (Xmen) - 100%