Mistake to overallocate in low expense funds for 401K?

[CobraGoat]

The following are the funds available for me to invest in through my firm's 401K with each expense ratio:

1. Gold Sachs Short Durat Gov (GSTGX)- .54
2. Dodge Cox Inc (DODIX)- .44
3. American Funds American Hi INc (RITEX)- .72
4. American Beacon Lrg Cp Value (AAGPX)- .86
5. Davis NY Venture (NYVTX)- .89- 4.75% Front Load [img]/images/graemlins/shocked.gif[/img]
6. Vanguard 500 Ind (VFINX)- .18
7. American Funds Grth Fund (RGAEX)- .68
8. Gold Sachs Md Cap Val (GSMCX)- .82
9. Vanguard Mid Cap Ind (VIMSX)- .22
10. Northern SmallCp Val (NOSGX)- 1.00
11. T.Rowe New HOriz (PRNHX)- .84
12. American Funds Euro Pac (REREX)- .83
13. Dodge Cox INt Stck (DODFX)- .7

Obviously I know i need to diversify etc. But these expense ratios on the whole seem really high. Would it be a big mistake to heavily weight my 401K in the Vanguard funds specifically the 500 INdex, due to their much lower exp ratios? Also, how does a fund with a front end load effect me if it makes up a small part of my 401K portfolio?

I feel like i have a pretty crappy selection to pick from. Is there anything i can do to have better funds to choose from?

What about this allocation:

DODIX- 10%
VFINX- 25%
RGAEX- 25%
VIMSX- 15%
PRHNX- 10%
DODFX- 15%