QUOTE(nestlebliss @ Nov 6 2012, 02:44 PM)
im new to the game... using t57... i wonder whats the best SPG? in terms of accuracy? im tier 2 only lol

No best SPG per se. Each have their own strength and weaknesses. I can't comment on French SPGs, having not played them yet.
For early tier SPG: (Tier II to Tier IV)
T-57 - Fairly mobile, good ROF, weak shells
SU-18 - Nothing special about this.
Bison - Has a huge gun for its tier.
M37 - Again, good ROF, still weak shells.
SU-26 - Best SPG of its tier, only one with a turret so no need to deal with aim dispersion everytime you move your hull. Pinpoint accuracy too.
StrmPz II - Meh. I guess the only redeeming point is that it leads to the excellent Grille later on.
Wespe - More mobile than StrmPz, able to load AP shells for lulz.
M7 Priest - Pretty good ROF, excellent range. Marred by poor damage per shell.
Grille - Big gun for its tier, only one able to damage HTs reliably.
SU-5 - The dud of the Russian SPG line. Meh range, limited ammo. Only saving grace is that it has pinpoint accuracy.
The SPGs become pretty similar from Tier V onwards, though they still retain their unique characteristics. (All are able to damage high tier tanks, all have similar damage output and range are equalised for most part.) It's in the lower tiers where they are most drastically different.