A quick note to start: 12R is legal for starting characters. All that matters is the number and 12 is the cap. The R simply means it's a good idea to get a fake license for it. With that in mind, probably the best non-standard starting item for your character is titanium bone lacing, wires 3 takes too much Essence for your guy to still have 2 cyberarms.
Each of this guy's cyberarms is specialized--one for melee and the other for ranged (hence the ambidextrous quality). He's very tough (soaks with 30 dice), very accurate (18 dice with an assault rifle), alert (13 dice for visual perception), and doesn't have a crippling Charisma or Logic. I left Knowledge/Language skills blank since those are character-driven. He has lethal and non-lethal options at every size category (rifle, smg, pistol, unarmed), so no matter where he's going, he should have options. His SMG is his quiet option (and his 12P Spur), which is why it doesn't have explosive ammo. I didn't find room for the shotgun aspect of things and having both arms with melee characteristics would make things much more expensive, so I'd suggest picking up the Shock Hand in-game (maybe buying a glove if you really need to with his starting money). Note that his ranged-specialized arm only has 2 capacity left.
Chrome!
Metatype: D (Human/+3 Edge)
Attributes: B (20)
Magic/Resonance: E (0)
Skills: C (28/2)
Resources: A (450,000)
Karma: 31 (+6 from negative qualities of your choice)
[spoiler]
Body 5( 8 )
Strength 3 (see arms)
Agility 3 (see arms)
Reaction 4(6)
Willpower 4
Logic 3
Intuition 5
Charisma 2
Essence 0.04 (He’s more machine now than man…)
Edge 5
Physical Boxes: 13
Stun Boxes: 10
Initiative 11+3d6
Physical 6
Mental 5
Social 3
Automatics 5
-Assault Rifles +2
Unarmed Combat 5
-Cyber Implants +2
Perception 5
Sneaking 3
Heavy Weapons 2
-Grenade Launchers +2
Etiquette 2
-Street+2
First Aid 2
Athletics Group 2
Karma Expenditures
Ambidextrous (4)
Toughness (9)
+1 Charisma (10)
+2 Pilot Ground Vehicle (6)
+4,000 nuyen (2)
Augmentation
Smartlink, alpha 4,800
Reflex Recorder (Automatics) 14,000
Wired Reflexes (2, alpha) 178,800
Titanium Bone Lacing, alpha 36,000
Obvious Cyberarm 15,000
-Agility Customization (+3) 15,000
-Agility Enhancement (+2) 13,000
-Armor Enhancement (+2) 10,000
-Cyberarm Gyromount 6,000
Obvious Cyberarm 15,000
-Strength Customization (+3) 15,000
-Agility Customization (+3) 15,000
-Agility Enhancement (+2) 13,000
-Strength Enhancement (+3) 19,500
-Armor Enhancement (+2) 10,000
-Spur 5,000
Datajack 1,000
Subtotal 386,100/5.96 Ess
Glasses [4 capacity] 400
-Vision Enhancement (3) 1500
-Low-Light 500
Contact Lenses [3 capacity] 600
-Thermographic 500
-Low-Light 500
-Image Link 25
-Flare Compensation 250
Miniwelder 250
Jammer (4) 800
Crowbar 20
1 month low lifestyle 2,000
Fake SIN (4) 10,000
Fake Firearms License (4) 800
Fake Conceal & Carry License (4) 800
Fake Restricted Cyberware License (4) 800
Respirator (6) 300
Transys Avalon (6) 5,000
Micro-Transciever 100
Subtotal 24,645
Ares Alpha 2,650
-Shock Pad 50
-Gas Vent 3 (barrel) 600
-Imaging Scope (top) 300
-Airburst Link 600
x210 rounds of Gel AR ammo 525
x210 rounds of Explosive AR ammo 1,680
x3 AR spare clip 15
x6 Flash Bang microgrenades 600
x9 High Explosive microgrenades 900
Ingram Smartgun X 800
x3 SMG spare clip 15
x96 rounds of APDS SMG ammo 1152
x96 rounds of Stick-n-Shock SMG ammo 768
Yamaha Pulsar 180
-Internal Smartlink 180
x12 taser darts 60
Ares Crusader II 830
x2 spare MP clips 10
x80 rounds Explosive MP ammo 640
Armor Jacket 1,000
-Non-Conductivity (5) 1,250
-Fire Resistance (5) 1,250
Helmet 100
Toyota Gopher 25,000
Subtotal 41,155
Grand Total 451,900 (+4,000 from karma)
Starting Nuyen: 2100 + (3d6 x 60)
Common Dice Pools/Limits:
Soaking Damage: 30 (Wearing Jacket and Helmet)
Ares Alpha AR: 18/5(7)
Grenade Launcher: 14/4(6) (Buy 3 hits)
Ingram SMG: 16/4(6)
Ares Crusader MP: 16/5(7)
Unarmed Combat/Spur: 12/6
Perception (Visual): 13/8
Perception (Other): 10/5
[/spoiler]