Mattress Forum

I have been reading and learning about latex on this forum for quite some time.  Now I have made the move and ready to get some suggestion.

A little about me

• 6ft - 155lb
• prefer pretty firm mattress (when i went to macy the S&F extra firm ..2000$ one really stood out for me)
• start off on the back, side or stomach but 99% of the time I end up on my back in the morning (i am a back sleeper)

I bought a 3" medium firm (30-32) from mattress247 (ebay) and been having it on

1. the floor
   • i think i bottom out on this one but i get good night of sleep
   • i try folding the 3`` to 6`` and is way too plush 
2. a old spring mattress
   • 
     don`t bottom out and i sleep pretty good too
   • will throw the mattress away when i am done building my mattress

So I am thinking of adding another 3`` of extra firm (44 lld) as my core (ebay is the only place i found firmness at that range)

Do you think that is the best to mimic the firmness I experience from option (1) and (2) ? or better to have something else (doesn't have to be from ebay)

Lastly, I am open to build up the mattress thickness to 9" but rather not if I don't need to.  

Btw, Latex feels goooooood i love the elasticity of it.  

thank you, billy