You rifle is sweet! I used to own Kel Tech SU-16a rifle and did not really like it. It jammed alot and I think 5.56 calibre is just too lacking stopping power.
http://www.kel-tec-cnc.com/images/big/su16A_01.jpg
My next rifle should be SOCOM M14 riflie 7.62mm, something like that:
http://www.m1arifles.com/wp-content/uploads/2009/02/m1a-socom-ii-rifle.jpg
Shotguns are great for home defense - you have 8 rounds and the clicking noise that they make is enough to dissuade most intruders.
I also like Magpul Masada and perhaps I will get the new bulpup Tavor in 5.56 or 7.62, if available.
Well, I think you are right on for looking into the Magpul. As far as 5.56 not having enough stopping power, that debate has been going on for half a generation. And, from my own research, I can determine the 5.56 does not lack stopping power, rather it lacks proper configuration in the battlefield. Civilians can own ballistic-tip, hollow-point, high-grain 5.56 cartridges that the military is not allowed to use. The military is confined to NATO ball ammo, which will be of the M193 or M855 penetrator variety. Both these ammos lack stopping power, because they are full metal jacket and have minimum expansion on the targets they hit. Also, the military is stuck using bullets of a weight ranging from 55gr- 62 gr bullets.
I have an LMT AR-15 rifle that has a 1:7 twist barrel that can easily stablize the heavier weight bullets compared to a 1:9 twist barrel. All mil-spec weapons are using the higher twist rate on their M-16/AR-15 rifles, but the military rarely utilizes the heavier weight bullets that these type of guns are capable of handling. The result is, you have a gun that is not used to its fullest potential. However, Joe American Consumer is not restricted to all kinds of NATO/UN bullsh*t that our military is and we can purchase any type of rifle configuration and cartridge we wish.
So, my AR-15 guns will serve me much better than any 7.62 x 51 (.308) rifle at close range, because in close quarter combat, you need to have time to make fast follow up shots. WIth a .308 the recoil will certainly inhibit you. I will load my LMT rifle with 64gr-77gr bullets which have very close stopping power to 6.8mm round, which is a step up from the 5.56. NOw, add to that a ballistic tip or hollow point that violently expands into human flesh , you have yourself a very powerful round. 6.8mm would be a great choice, if it wasn't so damn expensive to use this ammo. Unfortunately, the military doesn't utilize this round, so there is not much of a market for it.
Not all 5.56 is the same, do some investigation before you make a claim that the entier round is not effective. The round shot out of an AK is 7.62 x 39 is also very ineffective, but does have a harder punch. the 7.62 x 39 of th AK-47 is a round that is not aerodynamic and generally results in poor accuracy once you start getting past 50 yards. Its not uncommon for these bullets to curve left or right of your target.
The 7.62 x 51 is the best man stopper for longer range targets, but at close range its not a better round to use than a 5.56 using a higher weight hollow point/Bal TIp bullet.
This is a good example of the type of ammunition I would use in a attack where islamic-zombies are raiding my house. One moderately well placed shot with this round and your target is likely going down. Remember at close range, the .308 will also have overpenetration. You don't want that.
Shotgun is good for home defense. Forget about using the clicking sound to scare away an intruder, that's an old wives tale. My shotgun uses 12 round magazines and I don't have to worry about running out of ammo so much with it. Nonetheless the thing kicks like a mule.. Not always ideal for multiple attackers. If you under attack by muzzies, don't bother with a shotgun.