(SPOILER ALERT):
Highest ST requirement for weapons is 7.
Since you can get +5 (6 if you waste a perk) to ST you don't need more than 2 in ST, but that would make the beginning a bit too tough, so I'd go for 4-6 in ST.
PE. You'll want Sniper which requires 8 in PE. You'll get +1 (+2 if you waste a perk), so you don't really need more than 7.
EN. If you take a level or two of Lifegiver you'll swim in HPs, if not, well, it doesn't really matter that much. I usually go with 4. If you want Toughness you can always use Buffout...
CH. Depends on your character. You can get +1 and an additional +1 with shades (and another +1 if you waste a perk). Do you want many followers? I usually have between a CH of 6-8 in the start of the game but I lose 2 due to the implants (I almost always choose to take them) but the +2 I get makes up for it. If you don't care about diplomacy or friends and like being ugly as fuck you can drop it to hell...
IN. Since you're using Gifted I'd at least get 6. No point getting it higher than 9 though. I usually go with 7-8.
AG. 10. You'll want lots of APs to shoot as many times as possible. 9 if you feel for wasting a perk.
LU. Sniper perk is dependant on high Luck. I usually start with 6 since you can get +2 to it (+3 if you waste a perk).
Traits:
Gifted
Fast Shot
Small Frame is very useful but if I RP I don't take it (since I'm not particularly small in RL)...
Perks:
Sniper
Better Criticals
Bonus ROF
x2 Action Boy
Toughness is nice to have but shouldn't be taken more than once or twice if you plan to box and/or use implants and use PA/APA (90% is max DR).
Lifegiver is useful if you're playing on Tough (or was it Rough) difficulty.
Awareness is useful but not quite as essential as everyone and grandma claims...
Bonus Ranged Damage is useful if you use high ROF weaponry (x2 Bonus RD makes +160 damage with Avenger Minigun). If you'll be using one shot weapons Living Anatomy is better.