@Dr_Fambo is one of the few thinking about what is really "enthusiast" grade, in my opinion.
Don't forget about the used market either.
Used Lanner FW-7582A, 6 Intel 82583V nics, PCIe x8 slot, USB 2.0, serial, RTC, LCD character display in 1U box. Came with i3-2120 and 4 GB memory -- US $89 on eBay
Upgraded to Xeon E3-1265L V2 -- US $99 on eBay (lower power consumption, higher performance)
Used Archer C7 v2 as "dumb AP" -- US $40 through Craigslist
2x8 GB memory sticks, DDR3 1333, from my junk drawer
Even with the original i3-2120 and 4 GB RAM in there, I pretty much guarantee it runs circles around any of the high-end home wireless routers on the market, at under US $140 (including the Archer C7). It can easily handle 2 Gbps throughput without breaking a sweat.