100nl pocket aces

[rags2rich20]

Hand #40567843-47555 at Jacksonville (No Limit Hold'em)
Started at 05/Apr/07 03:51:48

ch_13 is at seat 0 with $74.30.
Rags2Rich is at seat 1 with $111.35.
tommyguns8316 is at seat 2 with $207.95.
Mucho Moco is at seat 3 with $106.40.
Black Parade is at seat 4 with $109.65.
barnett64 is at seat 5 with $175.05.
The button is at seat 1.

tommyguns8316 posts the small blind of $.50.
Mucho Moco posts the big blind of $1.

ch_13: -- --
Rags2Rich: Ac As
tommyguns8316: -- --
Mucho Moco: -- --
Black Parade: -- --
barnett64: -- --

Pre-flop:

Black Parade folds. barnett64 calls. ch_13 calls.
Rags2Rich raises to $5. tommyguns8316 calls. Mucho
Moco calls. barnett64 calls. ch_13 calls.

Flop (board: 4s 3h 8h):

tommyguns8316 checks. Mucho Moco checks. barnett64
checks. ch_13 bets $15. Rags2Rich ???

it is a drawy board and i have peopel behind if i raise. if i call i invite more action so do i just raise and hope somebody hasn;t checked set?