British audio company RHA is making its first foray into the American market with its budget-priced MA450i and SA950i headphones. Sold in black or white, the noise-isolating in-ear MA450i earphones ($50) are equipped with 10mm drivers and an in-line remote, made from aluminum, and packaged with seven sets of ear tips. They’ll be available here in mid-October. By comparison, the larger on-ear SA950 headphones ($60) feature 40mm titanium-coated…