what are some songs that have great buildups and/or breakdowns in your opinion

Although it's a bit over the top, it's definetly a hard trance classic:

Beam vs Cyrus - Thunder In Paradise (DJ Scot Project Remix)

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Infected Mushroom

"Dancing With Kadafi"
"Symphonatic"

'Nuff Said...

rank1 - such is life
push - strange world
svenson - sunlight theory

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Accuface – Is There Life On Mars?
Accuface – Millenium Bug
Amara – Pulse
Blank & Jones – Beyond the Time
Blank & Jones – Flying To The Moon
DJ Kim – Jetlag (Alphazone Mix)
DJ Scot Project – Overdrive (sort of, buts it’s a cool song so what the hey)
DJ Tiesto – Suburban Train
GTR – Mistral (Original Mix)
Mauro Picotto – Alchemist
Mr. Phillips – 7th Day (I Will Be There) [Michael Woods Mix]

These all have some fairy good buildups and a few breakdowns. But they are good songs as well, so whatever, you should like them anyways.

I am too lazy to go searching through my song list right now, ill try finding more later.

Push - Strange World. Builds up nicely, 2 great breakdowns. I don't usually like tracks with 2 builds/breaks, but this one really does it nicely, 2nd breakdown has a completely different structure and there's not much of a 2nd build.

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Just when you thought this was over, it had only just begun...

Tremendous build-ups / breakdowns....hmmmm.....

DJ Tiesto - Urban Train (Cosmic Gate Remix) <= My favourite build-up
Joop - Act of God (Hardtrance Edit)
ASYS - Storm & Thunder <= Especially when the bass kicks in @ ~1:30 min
Hennes & Cold - The second trip (DJ Scot Project Remix)
Thomas Rubin - Cold night (DJ Scot Project Remix)
Kan Cold vs Frank Ellrich - Transmission

Kick ass builup:

Voodoo & Serano - Blood Is Pumping (Pumpin' Club Mix)

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My fave is the melodic trance part from the sound of nature part 1. Song builds for 4 mins then just kicks you in the ass with that break

The Gift - The Seventh Day
Darren Tate - Fall From Grace
Salt Lake - Rendezvous (Rusch & Elusive mix)
Ronski Speed - Iris

...are some of my personal favourites.

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Living is hard. Life, on the other hand, is beautiful.

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November Demo mix

Um, hello? You guys are all missing a very important one...

Lost Witness- 7 Colours (Original Mix)

Martin Eyerer - Welcome to Heaven (Strokers 2001 Remix)

Most of what I was going to list has already been listed, but here's one that has one of the best breakdowns ever...

Delerium feat. Sarah McLachlan - Silence (Tiësto's In Search of Sunrise Remix)