seriously look at the 990FX range from ASrock. should be close to your budget and they offer everything you require.
you cannot judge a component, or anything for that matter, on price. just because something is more expensive does not make it better.
things to consider :
pci-e spacing
pci-e speeds in CF/SLI
SATA III ports
USB 3.0 Ports and Headers
Ram Slot & other Components positioning (for aftermarket coolers)
Chipset
CPU Support
ummm cant think of anything else.
ASRock 990FX Extreme 4
■Premium Gold Caps (2.5 x longer life time), 100%Japan-made high-quality Conductive Polymer Capacitors
■Supports AM3+ Processor, 8-Core CPU
■Supports Dual Channel DDR3 2100(OC)
■Supports AMD Quad CrossFireX™, 3-Way CrossFireX™ and CrossFireX™
■2 x Front USB 3.0, 2 x Rear USB 3.0, 8 x SATA3, 2 x IEEE 1394
■Dr. Debug, Power/Reset/Clear CMOS Switch with LED
■Supports XFast USB Technology, Graphical UEFI BIOS
■Supports On/Off Play Technology, Instant Boot, Instant Flash, APP Charger, SmartView, Turbo UCC
■7.1 CH HD Audio with Content Protection, supports THX TruStudio™
(not sure why the pic on their site looks like it has thermal paste all over the cpu socket

)
not sure when it is out though and im not sure if it will have SLI support.
EDIT : ok on the specs page on their site :
- 3 x PCI Express 2.0 x16 slots (PCIE2/PCIE4 @ x16 mode; PCIE5 @ x4 mode)
- 2 x PCI Express 2.0 x1 slots
- 2 x PCI slots
- Supports AMDTM Quad CrossFireX™ , 3-Way CrossFireX™ and CrossFireX™
- Supports NVIDIA® Quad SLI™ and SLI™
so think it will do sli too.