How would you play this?

Ok, for once, I won't tell ya how I played it...i want comments as if you were in the same spot.

This the 5k Deep stack, 2 hours in or so...average chip stack is 11000. Table has allowed a lot of limpers lately. I'm in 39th position with 72 players left, pays top 18.

Seat #3 is the dead dealer
Seat 1 - SALTYPEANUTS (4,304 in chips)
Seat 2 - CCOX1933 (5,732 in chips)
Seat 4 - ALLYNLONG (12,348 in chips)
Seat 5 - BALZ130 (19,550 in chips)
Seat 6 - FRANKYBGOOD (8,075 in chips)
Seat 7 - BIGLOU844 (25,154 in chips)
Seat 8 - IEATDONKS (17,569 in chips)
Seat 9 - RIKNROL (7,779 in chips)

Everybody Antes 25
ALLYNLONG - Posts small blind 150
BALZ130 - Posts big blind 300

*** POCKET CARDS ***
Dealt to FRANKYBGOOD [7d Ad]

Even though this is not a great UTG hand at all, the previous table action lets me think i might be able to see a flop for the minimum price so i limpcall.

FRANKYBGOOD - Calls 300
BIGLOU844 - Calls 300
IEATDONKS - Folds
RIKNROL - Folds
SALTYPEANUTS - Calls 300
CCOX1933 - Folds
ALLYNLONG - Calls 150
BALZ130 - Checks

It worked, I saw the flop cheaply...

*** FLOP *** [4d 2d 6h]

Considering, that's a pretty good flop for me.

ALLYNLONG - Checks
BALZ130 - Checks

So, I got the nutflush draw and 2 overcards. Then again, there had been a few limpers with some pretty big aces so an ace might not be a winning card for me. I decide to put a feeler bet on the draw out there with about 1/3 of the pot after takin all my clock.

FRANKYBGOOD - Bets 600

BigLou immediately raises to 3.5k
BIGLOU844 - Raises 3,500 to 3,500

Now, the guy is the table chip leader and has been bigstackbullyin quite a bit postflop.
But then, Salty shoves it allin. He's the short stack of the table and close to last in the tourney.
SALTYPEANUTS - All-In(Raise) 3,979 to 3,979
ALLYNLONG - Folds
BALZ130 - Folds


So...I dont think BigLou has a monster but he likely doesnt have air either...which means, he's likely commited and would call my allin protection re-shove.

So 2 possibilities because just callin the allin is not an option cause i cant fold if BigLou puts me allin:

1)I fold and still have 7000...so i still have an M of 14 and could still play to build the stack.

or

2)I go for the win and the big payoff, shove allin and if i win the pot (assuming BigLou doesnt have complete air and calls) I end up in the top5 in chips. Of course, if i don't hit the diamond, I'm out.

What would you have done and plz explain why...

Thanks
Franky
PS: I'll give it a week or so and then post what I did and what happened.