For a large home theater with a large seating area, I would strongly suggest getting a pair of quality, powerful subwoofers. Don't skimp out on a couple of $200 budget subs, then later have to re-buy "good" subs for HT. Buy once, cry once. Obviously, $1500 isn't going to be enough of a budget for a 5.2 speaker set up, but you can add speakers as you go. Right now the Monolith THX Ultra 12 sub is on sale from Monoprice via rakuten.com for $660. You could go the route of buying one now, then buying a second later. This would allow you to also get started on your speakers within that $1500 budget.
Subs>RBH I-12e/I-12. HSU VTF-15H mk2. Monolith THX 12(x2)/THX 10(x2). XTZ 1X12. SVS PB-1000(x2). Speakers>JBL Studio 530/520c, 270/230/235c/225c, Arena 130/125c. Jamo S807/S803. Pioneer FS52/BS22A/C22. Sony CS3/CS8/CS5. QA 3020i/3090Ci, 2020i/2000c. Monolith AM Cinema 5 bs. Polk RTiA1/CsiA4. Infinity R152. Other Audio>Sony MDR-Z7m2, WH-XB700, XB32, XB31.RBH EP1. Logitech GPro HS. Plantronics RIG 500 Pro HS. LG FH6,RK8,PK5,PH4. UE Boom3.