Class Building Help, Gnome Illusionist WITHOUT shadowcraft mage, ect

[Lansadar]

Hey guys, love the forum, ive been digging deep into all the old posts about the Gnome Illusionist(RoS) and im making one that dosent use the shadowcraft mage or shadowcrafter PrC. Ive got it this far but would really love some input on feat placement and Final PrC.

Gnome Illusionist 1/Wizrad 2/Master specialist 1/Gnome Illusionist 1/Master specialist 4/Gnome Illusionist 1/Master specialist 5/Wizard 5

Or

1 Gnome Illusionist / Spell Focus: Illusion (PhB)
2 Wizard
3 Wizard / Spell Mastery (PhB)
4 Master specialist / Skill Focus (Spellcraft) (CM)
5 Gnome Illusionist
6 Master specialist / Heighten spell (PhB)
7 Master specialist / Greater Spell Focus (CM)
8 Master specialist
9 Master specialist / Signature Spell (FPhB)
10 Gnome Illusionist
11 Master specialist
12 Master specialist / Arcane Thesis (PhB2)
13 Master specialist
14 Master specialist
15 Master specialist / Earth Sense (RoS)
16 Wizard
17 Wizard
18 Wizard / Earth Spell (RoS)
19 Wizard
20 Wizard Bonus Feat ? ?

So, the idea behind the build thus far is silent image, casting it hightened at any level replacing a prepaired spell. And im looking for as much +CL or add to saves as possible, the longer the mobs believe it the better.

I know i could use the feat Shadow Weave Magic, (FPhB) but im not sure if its really worth the negatives. As for the last 5 levels of wizard, ill drop them for a PrC that works if theres one.

Is taking Earth sense/spell worth it ? and that late ?

Should the order of the feats change to maximize the CL ?


Thanks for the help guys
Lans

[Lansadar]

Sorry for the double post, got an error the first time.