Heres my take:
SP1:
Board: As you said..no board for the SP1..but when they do make one..get an APE not a Blackheart.
Q-Loader: I take back what I said about the Qloader. Though cumbersom (having to carry the 500rd loader around everywhere) it is actually very nice. Id have Varnel tune the pods for maximum efficentcy. I tested the Qloader on my G36 and I love it.
Red-Dot: Go for it! Ill send you a link to one that looks killer on the SP1.
A5:
Squishy Paddles: A MUST
New bolt/tube: Useless..dont waste your money.
AK-47 Shroud: Baller!! Make a Krinkov AK-74u!!
I second everything Enhander said. Except for the let Varnel tune your pods.....I dunno if I could handle another 5 hours of tuning! I'd say try to tune them at first it teaches you a lot about the qloader. If you have any questions ask away and I can help you as I am now a Qloader expert. (I'm rly considering a 500 round setup for my TM-7). If you can't get them though just ask and I will meet up with you and help. They take much time to get right but when you do watch out!
Also on the bolt/tube comment as Enhander said pointless to upgrade. There is a reason Tippmann has been running the same stuff for 100 years or so...polish the internals nice and you'll be smooth enough. I would us that money to instead get Wargear or Squishey 2 paddles and some form of Vortex mode.