Question [Q] Best ROM/KERNEL combo for RAM?

It's been a while since I've been here. My current setup is: Xperia NXT LE rom & Gingerbread v12 Kernel. I get about 190-240mb of free RAM when most things I don't need are stopped, has anyone here achieved more than that with a newer/more up to date combo? Just curious. Thanks guys.
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Xperia Play R800X (2.3.3) w/UnlockedBootloader & DooMKerneL V2 ~ Cola ROM
Xperia Play R800AT (2.3.7) w/UnlockedBootloader & LuPuS V5 ~ Xperia NXT LE ROM
Both w/ miscellaneous tweaks for performance, battery life, & features (RAM:290-250MB)