1/2 Teach me some razz value

[ajmargarine]

Should I be raising 4th or 5th street here? And what would your thought process be behind raising either street? Tx.

PokerStars Game #6000557485: Razz Limit ($1/$2) - 2006/08/21 - 15:37:59 (ET)

*** 3rd STREET ***
Dealt to xhimit [Tc]
Dealt to unipokerstud [8s]
Dealt to Leana [As]
Dealt to CaptainMAD [Th]
Dealt to AThermopyle [4s]
Dealt to mbardsen [Jc]
Dealt to harpaatti [Jh]
Dealt to ajmargarine [4d 3d 5c]
harpaatti: brings-in low $0.50
ajmargarine: raises $0.50 to $1
xhimit: folds
unipokerstud: folds
Leana: folds
CaptainMAD: folds
AThermopyle: calls $1
mbardsen: folds
harpaatti: folds
*** 4th STREET ***
Dealt to AThermopyle [4s] [3c]
Dealt to ajmargarine [4d 3d 5c] [Ac]
AThermopyle: bets $1
ajmargarine: calls $1
*** 5th STREET ***
Dealt to AThermopyle [4s 3c] [Ah]
Dealt to ajmargarine [4d 3d 5c Ac] [7h]
AThermopyle: bets $2
ajmargarine: calls $2
*** 6th STREET ***
Dealt to AThermopyle [4s 3c Ah] [Td]
Dealt to ajmargarine [4d 3d 5c Ac 7h] [6s]
ajmargarine: bets $2
AThermopyle: calls $2
*** RIVER ***
Dealt to ajmargarine [4d 3d 5c Ac 7h 6s] [5d]
ajmargarine: bets $2
AThermopyle: folds
ajmargarine collected $12.80 from pot
ajmargarine: doesn't show hand