Well it's very l8 but i did looked through them all and personally-
2D
Bio-Mechanism
Solar Flare
Life With HLHS
2 Become 1

Haha and mine too of course

I love a lot of your hearts. My favorites would have to be:
Tuned into You - It's one of my first favorites for you.
Two Become One
Heart of the Ocean
Aviator
Love is the Key

I think I remember one that seemed like there was water in it, I couldn't seem to find it, but I adored that one too~

heart of the ocean
aviator
love is key
two become one
my endearing

(or just any of them that have keyholes XD;

Life With HLHS
Vascular Fusion
Wreath Of Barbs
Future Passed
Ode To Industrial

Barbed Rosette
Conspicuous
Pretty In Metal
Mechanical Growth
Love Is Key
Technicolour

Heart of the Ocean
*** Pretty In Tiffany ***
Hindered Flight
Love is Key
Fabricated Heartbeat

I think these would be nifty
Remedy
winged stitches
spring blooms
inked fusion
love on love off

and my runner up
tin mans heart

Vascular Fusion
Bloodline
Rodent Power
Tin Man's Heart
Heart of the Ocean

Well fav top 2 are Barbed Rosette and Sea Jewel (obviously xD)

As for another 3 I LOVE, that would have to be:
Ode to Industrial
Ocean Blue
My Endearing

But also love The Eternal ;D

I love all of them, but the ones with wings are my favorite. (Flying away, Aviator, etc.)