We have handle the Deka line For years.   
The Deka line has been very trouble free.  Batteries come direct from the manufacturing plant.
Most of them I pick up myself in Pa.
Make sure you compare
cca COLD CRANKING AMPS AT 0 degrees
Not ca CRANKING AMPS at 32 degrees.

                                           Compare to Part's America          
                      At Deka's own store 9/21/11
                                                                                        For the same battery you get.
34/78   700 cca  $59.95                    34/78 700 cca $98.98                             $72.71

34/78   850 cca  $69.95                    34/78 770 cca $119.98                             $78.30   

Ford 65 850 cca $69.95

   
Deka  Batteries
Farmers & Truckers
1031    $79.95
950  cca
post or stud terminals
No. 24 $69.95  DEEP CYCLE
No. 27 $69.95
$80.36 at Deka's own store.   
Do to high junk prices. Cores are reg. $15.00.  If you do not have a old battery to trade in.
                                            31's $1
8.00