The big problem with summoning (and especially binding) is drain.
Here is my character Eiffel. (Using sum2ten which I don't know if you are allowed to). Almost exactly the same concept. Being an elf gives you better drain stats (downside fewer skillpoints but that's what you have JoaT for). My wakyambi uses Intuition tradition but an ordinary elf with Charisma tradition would give even better drain stats.
Wakyambi elf Sioux Tradition "Eiffel" :
Priorities: Meta: B, Attributes: B, Magic: A, Skills: E, Resources: E (Sum2ten)
Attributes: Bod 3, Agi 3, Rea 5, Str 1, Cha 5, Int 7, Log 2 (karma), Wil 5, Edge 7, Magic 7, Init 12+1D6
Qualities: Mentor Spirit (Eagle), Focused Concentration (rat 1), Excep Attr Magic, Jack of all, In debt IV, Phobia Unc Mild, Prejudiced Spec biased, Weak immune system.
Skills:
13(15) Spellcasting 6+2 (Combat)
13(15) Summoning 6+2 (Guardian Spirits) (Also 15 dice Air Spirits with bonus from Eagle)
8(10) Assensing 1+2 (Signatures)
12 Counterspelling 5
10 Perception 1 karma (+2 from Eagle)
13(15) Binding 6+2 (Air spirits)
Spells: Lightning Bolt, Stunbolt, Detox, Heal, Inc Reflexes, Clairvoyance, Combat Sense, Trid Phantasm, Levitate,
Gear: Lodge rating 6, Yamaha Growler, Fake SIN rat 4, Low lifestyle, Armor Jacket, Renraku Sensei, Some reagents
Contacts: 3/2 Talismonger, 5/2 Triad Incense Master, 2/1 Hermetic Academic.
Karma spent: 10 Logic, 25 pos qualities, 2 perception, 12 metatype
I'm dodging as good (or better) as most samurai. Magic 7 is nice for summoning (and the extra die for everything else). With my Edge I can even try to bind F6 spirits. F7 requires a better lodge. Jack of all trades will make it fairly easy to buy some skills I want to have. (Etiquette, Sneaking, Ritual Magic)
If you are planning to sustain a lot of spells, it might be worth it to get 17 dice in one sort of spirit (Air in my case). Otherwise 15 is plenty enough even for F7 spirits. Again, the problem is drain.