Which Suit?

Hey everyone, I'm in a bit of a predicament.

Just to lay down the basics:

I'm about 5' 6.5".
I weigh about 125.
I need a suit (including all tailoring) for less than $800.
I am using this to go to prom; I'm not getting a tuxedo for many reasons.
I have an average "fit" build- I run track and work out a lot but I'm not that big.

I want a fit like: http://www.gq.com/style/wear-it-now/201006/xavier-samuel-models-cotton-suits-under-four-hundred-dollars?slide=4    (you need to click to slide 4. slides 1-3 are also good but I really like four)

Now I'm going to list out some choices: (ranked in order I like them)

#1: http://www.jcrew.com/browse/multi_product_detail.jsp?GENERIC%3C%3Eedit_product_flag=true&FOLDER%3C%3Efolder_id=2534374302030941&PRODUCT%3C%3Eprd_id=845524441798627&remove_cart_index=1&nav_type=PRMNAV&bmForm=persistent_shopping_cart&bmFormID=1331497309472&bmSubmit=edit_cart_item&bmUID=1331497309472

Top: 36/S Heather Charcoal       
(should I change to black? should I get 36S or 36R? I'm assumming 36S is for people under 5' 8")

Bottom: 28 Waist, 29 inseam, no cuff

#2 http://www.groupon.com/deals/stephen-seo
Bespoke Suit from Stephen Seo (no measurements required at this time)
One more day to get the groupon- very cheap bespoke suit.
Outsourced to China I believe and people are skeptic about this.
However, he has designed for the cast of Entourage.

#3 Suit Supply
Have not really looked into this but the go-to choice that many people like.

I could use the help. I feel like Jcrew would look really well.

Thanks for the advice so far guys.

I will probably use it again. I'm going to college so I'll probably wear it a few more times for some symposiums or for business casual days at school.

I have not tried on a suit since 8th grade. I do however, live near the new 50 Hudson Jcrew store (especially for the Ludlow suit). I'm just posting here to get an opinion but I'm definitely going to the store to get the master tailor's opinion.

I guess the bespoke suit is a bad idea? :)

I'll pass on the flashy SuitSupply one because I just want a basic suit.

By time- sensitive, I meant that I would need to decide soon.

The bespoke suit takes 8 weeks to make after the appointment and my prom would be around that time (expect the unexpected).

@add  The Groupon is affordable enough to get a Stephen Seo bespoke. I'm not sure about it's quality though.

@black By master tailor, I mean the tailor in charge. No disrespect. And I just want to know which suit would be better suited (no pun intended) to get the look I posted. I don't have time to visit yet but I'm going soon.

@scott There's no need to take ad hominem shots. Regardless, I'm probably smarter than you; mind you, I'm only 17 years old. While you're sitting on your high chair and feeling superior, I'm just sitting here chuckling at how ignorant you are as an adult. I don't even feel justified to answer why there are three threads. Cheers.

@add It was only a bit over the top.

Back to the original topic, I guess that the bespoke suit isn't really necessary. I had the same thoughts; I'm probably only going to wear whatever suit I buy around 10 times. By the time college rolls by, I'll probably be a bit taller or have a bigger frame anyways (recruited for lightweight crew so I'll need to add weight). I wanted to have a semi-decent suit to wear to prom and the bespoke suit "spoke to me." I'm more fashion forward than my classmates and wanted to be better dressed than them. I guess the Jcrew suit is good enough for the wow factor though.