I don't think your budget will allow a pair of X5660's or better - just one X5660 here in the US is over $1200 USD.
Below links are to components at newegg.com, simply for recommendations. They do not ship internationally so you would have to investigate vendors that service your country:
Motherboard: Newegg.com - ASUS Z8NA-D6C (MIO) Dual LGA 1366 Intel 5500 ATX Dual Intel Xeon 5500 and 5600 Series w/ MIO Sound card Server/Workstation Motherboard
CPU: (2) Newegg.com - Intel Xeon E5645 Westmere-EP 2.4GHz 6 x 256KB L2 Cache 12MB L3 Cache LGA 1366 80W Six-Core Server Processor BX80614E5645
Memory: ECC is supported but not required, you can save considerably by using standard ram.
(2) Newegg.com - Crucial 12GB (3 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10600) Desktop Memory Model CT3KIT51264BA1339
I would use one SSD for your OS/software and standard hard drives for your data. RAID is not necessary, but if you want to use it, the motherboard controller supports it.
Newegg.com - Intel 320 Series SSDSA2CW120G3K5 2.5" 120GB SATA II MLC Internal Solid State Drive (SSD)
Power supply is dependent on which graphics card you choose. The best card for the money for Premiere Pro is not a Quadro - it's a GeForce GTX 570. You would need around a 650 watt power supply, Seasonic is highly recommended.
All components are sold with a manufacturer's warranty, which varies in length. Intel retail products are generally 3 years. Different vendors have different initial return policies.