I don't want to sound like a suck up or anything, but I want Weezer to sound like Weezer and think Pink Floyd, while great in their own right, isn't something I'd associate with any Weezer CD's. That's probably because you haven't listened to them? haha, I would say some other bands that make songs that make me want to get loud and make my presence known in a crowded area are Ramones and The Clash (London Calling especially).
As a side note, I'm currently working at a call center, dealing with different music website customer support for Rhino Records and the Grateful Dead and if you listened to some of the stuff the Dead has done and somehow incorporated that with a fine Weezer song, that would be synergy at its finest as far as experimental tracks go.
When dealing with Dead Heads every day and knowing that this type of following is out there for a band that each customer will willingly spend hundreds and hundreds a month on live show recordings and box sets, it makes me happy that Weezer is my favorite band because even though I'm not a rich person, some of my paycheck will always go to something Weezer if it's available. The past few months have been a real treat.
If I remember correctly, in one of the Alone albums you mentioned in the liner notes debating whether to buy Pet Sounds of Led Zeppelin IV at the used CD bin.
So go for some Zeppelin, honestly they're all good, although Zeppelin I and Houses of the Holy are my favorites.
I'm also a huge Pink Floyd fan, but I think that topic has been covered here pretty extensively... Although I haven't seen much mention of The Wall or The Final Cut, which are the peak of Roger Waters writing...
NIck Drake -- Way to Blue, Five Leaves Left The Jayhawks -- Tomorrow the Green Grass Wilco -- Yankee Hotel Foxtrot
None of these sound like Pink Floyd, but they're some of my go-to albums. If nothing else just download the mp3 of Drake's "Riverman" and " Northern Sky" . Also, I'd second all the suggestions of Queen and Ben Folds.