Depends on your goals; and how long you plan to keep your car. Also not sure how legal car mods are in Moscow (especially a down-pipe and such). I only have my paddles, (which I made) and a tuner (piggyback) from these guys -
www.turbotransformer.com
I really wanted a BM3 but I decided to buy the Turbo Transformer because a few people had issues with BM3 and I really wanted something easily removable. There is also burger which everyone seems to have but it is pretty expensive for a piggyback.
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MODS: Turbo Transformer boost controller, ECO-SPORT auto selector (home brew), Electronic boost gauge vent mounted, RPM based LED Carbon paddles
WISHLIST: BM3, HPFP, Turbo + IC + water ... new car eventually