Here's a list of some of the stuff I use in my studio:

• Mac Pro 8core, early 2008 model
• Yamaha P-140 electronic piano
• Uad-1 PCI Express
• TC Powercore PCI Express
• Acoustic Energy 8" nearfield monitors and subwoofer
• Arturia Arp2600 and Arturia MiniMoog software synths
• Native Instrumens: Battery 3, Massive, Fm8, Reaktor 5, Pro-53, Razore and Absynth 4
• Logic Studio 9 + Ableton Live (occasionally)
• Fxpansion Geist for drum programming outsite of the Logic world
• Microtonic
• For visual monitoring I use Inspector XL, Voxengo Span, and Waves Paz.
• Waves Gold
• Fabfilter Volcano 2, Timeless 2, and Twin 2.
• Avid mbox audio interface
• Fxpansion DCam
• SPL Transient Designer for treating my poor drums

Some older hardware synths include: Novation Drumstation, Novation Nova.

Native Instruments Massive:

I've been using Massive and custom built Reaktor ensembles for my music since 2006. Massive is very flexible, and despite the fact that it's been so extremely popular and widely used, Massive is not just for making ugly dubstep. The interface is easy to grasp, and the sound is crisp and clear

Mixing to mastering plugins?

Some producers mix to their mastering chain, meaning they have compressors, limiters and/or eq set up when they start the project. Why? It certainly lets you get an idea of what your track will sound like after mastering, so that you can compare your track with whatever you think sounds good in the first place. I've been using this technique myself quite a lot. Among other things, it lets me monitor how loud my fx chains will sound after everything is compressed and limited. Without this treatment, I sometimes find it difficult to determine how loud my fx busses should be.