Sorry to chime in late but what I get from your post is that you are keeping the Strat and the LP and are not sure between a Dot and the SG.
From a pickup standpoint all three of the Gibbies have the same pickups.
The Dot has the Chinese version of them but test exactly the same impedence as the Studio and the SG. The GFS pickups may not be much of an upgrade.
I would definitely keep the Strat, The Dot , and the Studio. I would however spend a little more and get a set of Burstbuckers, or Classic 57s/Classic 57 Plus for the Dot.
If you are going to spend the money on an upgrade I would spend the little more and get the Gibson pickups, and do a pot and switch change as well.
You will then have a Strat, a 335 Dot, and a Studio. You will pretty well have everything covered.
The Blues is alright!
Guitars: 1968 Gibson SG, 2005 Gibson SG Standard, 2006 Gibson LP Classic Gold top, 2004 Epiphone Elitist LP Custom, 1996 Gibson Les Paul Standard. 2001 Epiphone Sheraton II, 2007 Epiphone G400.
Fender Strats: 1996 Fender 68 Reissue CIJ, 2008 Squier CV 50s, 2009 Squier CV 50s Tele Butterescotch Blonde
Amps: Blues Junior Special edition Jensen in Brown Tolex with Wheat front, 65 Deluxe Reverb reissue,1970 Sonax reverb by Traynor, Avatar Custom 2/12 Cabinet with Eminence Legend V1216 speakers,
2008 DSL100 Marshall Amp , Fender Super Champ XD,Fender Vibro Champ XD
Effects and Pedals: Fulltone Fulldrive II, Fulltone OCD, Fulltone Mini Deja Vibe, Fulltone Fat Boost, Dunlop Crybaby Wah, Boss DS1, Boss DD20 Giga Delay, Boss TU2 tuner, Boss BD2, Ibanez TS9 Tube screamer, Zoom 505. Radial tonebone hot british.