Budget PC build under $600

So, I asked around for some advice a few days ago, but now that I’ve actually secured a bit more funding for this purchase, I was wondering if it might be possible to squeeze out a few more upgrades for that $167 difference 🙂. Basically, I'm looking to buy this setup in cash, and my core requirements are pretty straightforward:
It needs an Intel processor, and it has to handle AutoCAD 3D and similar software without breaking a sweat. As for gaming, it's certainly not a priority, though I suppose it wouldn't hurt if it could manage a few titles here and there. Thanks!

1 x Intel Core i5-4460 Processor (3.20GHz, 1MB, 6MB, 84 W, 1150) Box
1 x MSI GTX 750 Ti 2GB GDDR5, N750Ti-2GD5/OCV1, Dual-link DVI-D x 1
1 x DDR3 4GB (1x4GB) Kingston, 1600MHz, CL11, Value
1 x MS VOYAGER midi tower case without PSU
1 x FORTRON 400W Power Supply, HEXA Plus 400, 12cm fan
1 x Asrock H81M-HDS, s1150, Intel H81, M-ATX, dual Channel 2xDDR3
1 x TOSHIBA 1TB, 7200rpm, SATA 6 Gb/s, 32MB, DT01ACA100
$1351
www.newegg.com

I'd rather go with an amd build. It’s just smoother to put together.

1 x Gigabyte 970A-DS3P, AM3+, amd 970 SB950, 4x DDR3 2000(O.C.)/1866
1 x amd FX-Series X8 8300 Processor 3.3GHz, 16MB, 125W, AM3+, FD8300WMHK
1 x MSI GTX 750 Ti 2GB GDDR5, N750Ti-2GD5/OCV1, Dual-link DVI-D x 1
1 x FORTRON 400W Power Supply, HEXA Plus 400, 12cm fan
2 x DDR3 4GB (1x4GB) Kingston, 1600MHz, CL11, Value
1 x MS PHOENIX case without PSU, Midi tower MBO: ATX, mATX
1 x HDD Seagate 1TB, Serial ATA III, 7200 rpm, ST1000DM003
1 x LC Power Cosmo Cool, 92 mm, Hydraulic bearing, 800-2200 rpm,
$1353

i5 4460
GIGABYTE H81M S2V
KINGSTON 8GB 1600 MHZ
SEAGATE 3.5" 1TB SATA 3 SSHD
GT 740 1GB GDDR5
ANTEC VP 400PC 80+
MS KNIGHT MIDI ATX

= $1347.