If you want to talk about unmodified weapons then just buy two warhawks and use one in each hand. You get to fire twice an IP, double the ammo, and you're still spending 500 cred on the two guns while only taking a -2 on the second shot without (the unmodified fubuki takes a -1 if you haven't already spent an action unfolding the stock or knew ahead enough to unfold it before the shooting starts). Heck buy four of them and spend the extra 1000 on hiring a couple of thug bullet stoppers to wield the other two for you.
You can say a 2000 cred price tag is nothing but it is it's more expensive than most weapons short of sniper/heavy. In the core book there's nothing more expensive right up until you hit the Aug(ish) multi-weapons platform that starts out as an assault rifle. It's an entire month worth of food/rent/entertainment/utilities/etc for your average person in setting. I've got characters that have finished entire runs with 2000 or less credits worth of profit.
I like how everyone's poh pohing the warhawks ammo capacity without saying anything about the Thunderbolt having 12 shots for a gun that only fires short bursts. As I mentioned in my little analysis (hopefully some people read it) that's four trigger pulls. Extended Mag gets you 15 while with an Additional Clip modification that's only 18 rounds (75% for pistol sized weapons).
To keep the discussion going: If you want to talk about a fully modded out weapon what would you pick for the Fubuki?
For the Hawk there's a couple of ways to go.
The workhorse.
Firing mode Semi-auto (Natch)
Personalized Grip
Internal smartgun (cheaper than external due to low base cost)
Ammo skip system.
You can buy one of these for the exact same price as a thunderbolt with a Smartgun system and no mods, or two for slightly less than what a Fubuki with no mods and an external smartgun add on costs. You can mix in a specialty rounds if that's your thing, a couple of stickies, a couple of AV rounds, one tracker round and one capsule round filled with something nasty. Just practice your Vin Diesel growl.
The crazy horse
Firing mode: Large change- Full auto
Personalized grip
Expanded cylinder
External smartgun
If auto-fire is the be all end all then here you go. Sure you've only got one shot, but during that truncated full-auto you've got a medium machine gun in the palm of your hand. Recoil's gonna be a bit of a problem, but it's great fun for the Sam with a gyromount in his cyberarm. Since we're going crazy we might as well load those silly Armor Piercing Flechetts in the bugger too. So we're looking at one attack with 15P+ net hits versus impact armor with a -2ap mod and dealing with a modest 3 points of uncompensated recoil (barring strength/body or over-modification)... This is gonna get messy.
3500cred is a bit pricy but now that I've imagined this up my mostly insane ork street sam/doctor is probably going to throw money at people until he gets one.
Side note. Sadly the sliver gun can't fire APF ammo. If you read the entry it says it fires metal slivers that "count as" flechette ammo. Not sure exactly how the ammo works conceptually for that but my reading is that it can't use other types of ammo.
Chandra: The Deputy?
