Prism
Explorer
I have also converted a Ftr/Rog/Wiz from a combination of 2e and rolemaster and I found some of the most useful options were in Unearthed Arcana
Being human I found that human paragon really helped keep the mix between combat, spells and skills. Although it seems your character is an elf you could houserule to allow this class
Also under the skills section there is a feat called Skill Knowledge which allows you to take 2 skills and make them class skills for your whole progression. This lets you keep such things as disable, open lock etc high whilst taking a non rogue level. With a good INT from being a wizard you can get anywhere up from about 6 skill points a level
My end 14th level progression was Rog1/Ftr2/Wiz3/HumanParagon3/EldritchKnight5
This gives me good skills, a pretty decent BAB, average hit points, and spells as a 9th level caster. I'm not at all bothered about the lack of sneak attack as I felt that skills emphasized my original character far more than backstab but you could mix in some Arcane Trickster levels too as some of the others have suggested
Being human I found that human paragon really helped keep the mix between combat, spells and skills. Although it seems your character is an elf you could houserule to allow this class
Also under the skills section there is a feat called Skill Knowledge which allows you to take 2 skills and make them class skills for your whole progression. This lets you keep such things as disable, open lock etc high whilst taking a non rogue level. With a good INT from being a wizard you can get anywhere up from about 6 skill points a level
My end 14th level progression was Rog1/Ftr2/Wiz3/HumanParagon3/EldritchKnight5
This gives me good skills, a pretty decent BAB, average hit points, and spells as a 9th level caster. I'm not at all bothered about the lack of sneak attack as I felt that skills emphasized my original character far more than backstab but you could mix in some Arcane Trickster levels too as some of the others have suggested