Chair Covers, Sashes, and Overlays. Oh My!

I've seen my venue with chair covers and without chair covers. I've decided that it makes a significant difference.

Without Chair Covers:

With Chair Covers:

I'm still debating what to do in this department, but I'm heavily leaning towards buying everything instead of renting. I've looked around my area and it's roughly $3.25 to rent a chair cover and sash. So for 125 guests that's $426.25 (not including if they have a delivery/set-up charge and tax). I've also looked online. At linentablecloth.com, they sell white, polyester chair covers (pictured at right) for $1.99 each. They have free shipping with orders over $50, so I wouldn't have to pay shipping. They also sell pink organza sashes, 10 for $7.49 ($.75 each) or satin sashes, 10 for $9.49 ($.95 each). Let's say I go with 125 chair covers and the organza sashes. For 125 guests that's $346.12. I'd be saving $79.13, and I could sell the chair covers and sashes after the wedding to another bride and recoup some of my costs.

I also found some great linens at www.linenclothsfactory.com. They sell their organza sashes for $.69 each. They also have very pretty crinkle taffeta sashes that I would love to have. They're $1.29 each.
Here are some more sashes and sash prices from linenclothsfactory.com:
Polyester sashes: $1.19 each
Satin sashes: $.85 each
L'Amour Satin sashes: $1.49 each

I need to figure out the look I'm going for before I make a big decision and purchase on linens. But here are some of my inspiration pics so far. (I can't decide if I want to go with pink or green sashes.)