I live in Canada and getting an OPTIMA battery is difficult where I live. I called the Canadian Distributor - East Tenn/Power Battery 1-800-668-9303 - and they quoted me the following prices:
$350.00 Canadian for the D31T Yellow Top
$280.00 Canadian for the 34/78 Red Top
My alternative is COSTCO. Here is what they have and prices:

Model - 75/35
Color - Red Top
Terminal - Red Top Dual Top & GM Side
Volts - 12
AH - 44
CA - 910
CCA - 720
RC - 90
L - 9.4
W - 6.8
H - 7.6
Lbs - 33
USD Price - $93.75
Price - $152.99 Canadian
Model - D34M 750
Color - Blue Top
Terminal - SAE Auto & 5/16" Stud
Volts -12
AH - 55
CA - 870
CCA - 750
RC - 120
L - 10.0
W - 6.8
H - 7.8
Lbs - 44
USD Price - $156.25
Price - $207.99 Canadian

Model - D34/78 -D750U
Color - Yellow Top
Terminal - Dual - Top & GM Side
Volts - 12
AH - 55
CA - 870
CCA - 750
RC - 120
L - 10.0
W - 6.8
H - 7.8
Lbs - 44
USD Price - $147.50
Price - $217.99 Canadian
If I don't buy an OPTIMA then another option COSTCO has is the KIRKLAND SIGNATURE LINE BATTERIES:
Item - 207180
BCI Group Size - 65
Price - $88.99 Canadian ($55 USD)
Cranking Amps @ 32ºF - 1000
Cold Cranking Amps - 875
Reserve Capacity - 165
Limited Warranty
• 24 months free replacement
• Up to 84 months prorata
or
Item - 207230
BCI Group Size - 34/78DT
Price - $88.99 Canadian ($68 USD)
Cranking Amps @ 32ºF - 1000
Cold Cranking Amps - 875
Reserve Capacity - 115
Limited Warranty
• 24 months free replacement
• Up to 84 months prorata
What do you guys suggest?