Go with the i5 CPU, and preferably the Z77 chipset for the mobo, and 8GB of RAM, those bits should set you back maybe $500.
I would recommend a SSD for the OS and programs, and a standard SATA HDD for your files.
1GB video card
From where I get my gear:
Mobo - Gigabyte Z77M $125, or $145 if you want Crossfire capability
CPU - Intel i5 $240
RAM - 8GB Corsair Dominator series $67
HDD - 120GB Sandisk SSD $140, SATA HDD WD 1TB-$130 or 2TB-$230
VC - Gigabyte 7850 (1GB) $279 or 7870 (2GB) $429
Monitor - Samsung 23" - $270
DVD - $30
Price so far $1281 cheap or $1551. Plus case, and crap like KB, mouse
Case? How long is a pice of string? You can get a cheap-ass $100 with a 50W PSU, or a fancy $300 one (usually the high end ones have no PSU.
I bought my Lian-Li case years ago and have upgraded it several times, it's rugged, has a slide out mobo tray, twin inlet fans, filters, and no sharp edges.
But each to his own.
You can save money by just going with a single non SSD drive, and that price is for the 3570K i5, you could get a lower spec one and a Z68 MB for lower cost