Pathfinder 1E Increasing my stealth capabilities in PF

I posted this over on the Paizo boards but figured I might as well go fishing for ideas here as well....

So I find myself needing to pickup some serious, mostly personal, stealth capabilities.
The more long lasting/constant the better.

The character is a 7th lv (soon to be 8th)tiefling wizard/Mythic 2 (divination school/Archmage path), 16 Int, 16 Dex. & a whole massive 1 rank in stealth.
Feat-wise I've got scribe scroll & Brew Potion that could apply.
Spell-wise I've got Invisibility & Invisibility Sphere as far as stealth goes.

I can't make any retro changes to the character. (nor would I want to).

Stealth was not part of the character concept, nor was it terribly important play wise until very recently. Unfortunately it's going to be important for the foreseeable future.

So, what can I do going forward? Any suggestions for Spells, Items, Feats, etc?
Thanks.

Feat
Skill Focus (Stealth): +3 to Stealth
Items
Elixir of Hiding (250 gp): +10 to Stealth for 1 hour
Cloak of Elvenkind (2500 gp): +5 to Stealth
Stalker’s Mask (3500 gp): +5 to Stealth

I believe there are also some prestige classes that help with stealth. From some of the early books.

stridert2 said:

I believe there are also some prestige classes that help with stealth. From some of the early books.

Click to expand...

Well that's a bit vague.... And nearly a year late. (I got it covered btw)