Miami's downtown dining environment has leaped forward in just the past few years — during the daytime, that is. And while it isn't difficult to find a fine lunch for less than a ten-spot, it would be quite a challenge to cop better plates of food for that sum than the ones encountered at these two recently installed hole-in-the-wall restaurants. Pakorn "Peter" Phansuwana's 16-seat Thai Churros serves zesty, home-cooked staples such as spicy seafood salad, tom yum soup, pad thai, beef in basil sauce — all $6.95 or less for lunch, and $9.95 or less at dinner (open daily 11 a.m. to 9 p.m.). Dibyo Kasiyadi, a former cruise worker from Jakarta, caters to his former industry mates and those lucky downtowners who have discovered his Matahari Café. They cram into the petite eatery each day (except Tuesdays, when it's closed) until 4 p.m. for the $5.99 lunch special (cash only), which brings a choice of Indonesian specialties such as grilled skewers of chicken or pork saté with peanut sauce, or chili-and-coconut-steeped beef rendang — each accompanied by a mound of steamy rice. Why take a Subway when for the same price you can catch a flight to Thailand or Indonesia?