hello out of these which should i get need to for the e savage

[link=http://www.modelshopleeds.co.uk/catalog/product_info.php?cPath=26_33_36&products_id=71&osC sid=bb452eb0a90a04fc5d3321523dad55ed]Tornado 8.4v 3700mAh[/link]


[link=http://www.modelshopleeds.co.uk/catalog/product_info.php?cPath=26_33_36&products_id=74&osC sid=bb452eb0a90a04fc5d3321523dad55ed]GP 3700 8.4v 3700mAh[/link]


[link=http://cgi.ebay.co.uk/8-4v-NiMH-3700mAh-Rechargeable-Battery-Vapextech_W0QQitemZ320178793734QQihZ011QQcategoryZ 2565QQssPageNameZWDVWQQrdZ1QQcmdZViewItem]8.4v NiMH 3700mAh Rechargeable Battery Vapextech[/link]


[link=http://cgi.ebay.co.uk/BRAND-NEW-SANYO-7-CELL-3600mAh-8-4V-RACING-PACK-R-C_W0QQitemZ330162030751QQihZ014QQcategoryZ140974QQ rdZ1QQssPageNameZWD1VQQcmdZViewItem]BRAND NEW SANYO 7 CELL 3600mAh/8.4V RACING PACK - R/C[/link]


what would have the least resistance as they all do 30 amp discharge current

thank you