GPON and "large developer community" might be a challenge. Many find that a separate "modem" allows one to get better ISP connectivity and reliability along with better routing and wireless performance. It also lets you be able to "trade one out" if it fails, or something better comes along. Yes, higher price for the combo, but at least I consider it a very worthwhile trade-off. (My cable provider's drop pouring water into my modem recently reinforced this for me.)
Edit: Adding RF cabling often negates any gains from external antennas, especially with feed lines more than a few cm long or those that are not using high-quality cable and connectors (expect to pay US$50-100 per feed line for what an RF engineer would consider "reasonable quality" at 2.4 or 5 GHz). Remote connection to an AP with Ethernet is preferred.