Hi all! im Matias, from Argentina, 30 years old, i speak english not very well , im sorry i need choise 1 preamp for my system (st70 + thiel 1.5 + dv9500 marantz) i have saw this systems used in my country: * bryston 11B u$600 * Sonic Frontiers SFL1 signature u$850. What is the best...