Actually, if you don't like the EK because it's boring, but don't think it's overpowered, you may want to pick up Arcana Unearthed. Monte's mage blade is about equal in power level, but has a LOT more flavor.
The following is from my post on Monte's boards:
Comparison - Fighter-Mage in D&D 3.5 versus AU
5th level:
D&D 3.5 - Fighter 1/Wizard 4
Hit Points 10+4d4 (20 average)
Base Attack +3
Base Saves +3/+1/+4
Access to 2nd level spells (2+bonus from stat)
Class Abilities (Fighter bonus feat, Scribe Scroll)
AU - Mage-blade 5
Hit Points 8+4d8 (26 average)
Base Attack +3
Base Saves +2/+2/+2
Access to 2nd level spells (0+bonus from stat)
Class Abilities (Athame, Shimmering Shield)
10th level:
D&D 3.5 - Fighter 1/Wizard 6/Eldritch Knight 3
Hit Points 10+6d4+3d6 (35 average)
Base Attack +7/+2
Base Saves +7/+3/+6
Access to 4th level spells (2+bonus from stat)
Class Abilities (2 Fighter bonus feats, Scribe Scroll, Wizard bonus feat)
AU - Mage-blade 10
Hit Points 8+9d8 (48 average)
Base Attack +7/+2
Base Saves +4/+4/+4
Access to 4th level spells (0+bonus from stat)
Class Abilities (Athame, Shimmering Shield, 2 Bonus Feats, Athame Defense, Sprightly Step, Summon Athame)
15th level:
D&D 3.5 - Fighter 1/Wizard 6/Eldritch Knight 8
Hit Points 10+6d4+8d6 (53 average)
Base Attack +12/+7/+2
Base Saves +10/+4/+7
Access to 7th level spells (1+bonus from stat)
Class Abilities (2 Fighter bonus feats, Scribe Scroll, Wizard bonus feat)
AU - Mage-blade 15
Hit Points 8+14d8 (71 average)
Base Attack +11/+6/+1
Base Saves +6/+6/+6
Access to 5th level spells (2+bonus from stat)
Class Abilities (Athame, Shimmering Shield, 3 Bonus Feats, Athame Defense, Sprightly Step, Summon Athame, Slice Through Wardings, Familiarity With Magic)
20th level:
D&D 3.5 - Fighter 1/Wizard 10/Eldritch Knight 9
Hit Points 10+10d4+9d6 (66 average)
Base Attack +15/+10/+5
Base Saves +11/+6/+11
Access to 9th level spells (2+bonus from stat)
Class Abilities (2 Fighter bonus feats, Scribe Scroll, 2 Wizard bonus feats)
AU - Mage-blade 20
Hit Points 8+19d8 (93 average)
Base Attack +15/+10/+5
Base Saves +9/+9/+9
Access to 7th level spells (1+bonus from stat)
Class Abilities (Athame, Shimmering Shield, 4 Bonus Feats, Athame Defense, Sprightly Step, Summon Athame, Slice Through Wardings, Familiarity With Magic, Spell Parry, Slice Through Spells)
In these comparisons, Mage Blades have a definite edge in HP and class abilities, while the D&D Fighter-Mage build has a significant edge in spell capability. Both have comparable Base Attack and Saves.
Overall, from what I can tell, a mage-blade would be a balanced addition to a D&D 3.5 game. Mage-blades have more of an emphasis on fighter (or anti-spellcaster, with their spell-negating class abilities), while the D&D fighter-mage has the definite emphasis on mage.