V is 21/10/2 over 30... basically unknown. Shoving over turn reraise an option?

Full Tilt No-Limit Hold'em, $0.10 BB (8 handed) Full-Tilt Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP1 ($2.70)
MP2 ($7.25)
CO ($12.65)
Button ($3.85)
Hero ($12.70)
BB ($5.50)
UTG ($9.20)
UTG+1 ($14.05)

Preflop: Hero is SB with 7, A.
UTG calls $0.10, 1 fold, MP1 calls $0.10, MP2 calls $0.10, 2 folds, Hero completes, BB checks.

Flop: ($0.50) A, 5, 7 (5 players)
Hero bets $0.45, BB folds, UTG calls $0.45, MP1 folds, MP2 folds.

Turn: ($1.40) 9 (2 players)
Hero bets $1, UTG raises to $4, Hero ....

Final Pot: $3.40