Cabinet question

Okay I'm getting a new amp a Mesa Big Block 750 head which i will be running into 2 600 watt@8ohm cabinets. At least one will be a Mesa powerhouse 2x10 the second will be either another 2x10 or a 1x15. Since I'm using 2 8ohm cabinets there will be 550 watts delivered to each of them. I'm just asking for advice on opinions for which set to get the two powerhouse 2x10's or a single powerhouse 2x10 and a single powerhouse 1x15. The music i play is almost jazz style bass meant to compliment a drummer who does a lot of double kick galloping and i also have a rhythm guitarist who does a lot of chugging galloping or ringing power chords and a guitarist who does a lot of Synyster Gates harmonizing leads and harmonic fills. Also i play primarily a Gibson Thunderbird bass.

Any advice would be greatly appreciated and i hopefully the information I've given will help on giving me advice.

 

I thought when you ran 2 cabs parallel they both got the full wattage at those ohms in this case 550 at 4 and they would only get 275 if they were ran in series. At least that's what i gathered from the manual but i could very well could be completely wrong

 

thanks for setting me straight