Shopping Dilemma: Business Lady Bags

I am having a heck of a time trying to find a new everyday tote bag for work.  I have one of those jobs where I carry a computer home each day, along with a notebook and other items that do not fit in my usual purse, and have blown through several bags that looked nice but were not meant to carry a crappy Dell laptop and workout clothes.  I'm currently schlepping a large jute tote bag around, but don't like that it is so casual.

My quest is made much harder by my budget, which rules out $300+ bags of any kind.  Even if I'll carry it for years, the amount of abuse this bag will get means a high price is not in the cards.  I'm just too practical.  That said, here are some options that meet my criteria of being chic, not overly embellished, with straps that can go over my shoulder, and enough structure to keep its shape despite carrying a laptop.  I would love some opinions!

I'll start with my dream bag - the Tropezienne tote by Claire Vivier, with 8" handle drop.  It's pricey, but so perfect!

This Banana Republic tote is well-priced, but I think I'd need to rig some sort of false bottom to help keep it from being stretched out by my laptop since the leather is very thin

Also, the gorgeous Jericho tote by J.Crew remains in the running despite the price. But I don't think I could bear to throw this on the floor under my desk.

I am also not opposed to canvas entirely, and this tote by Lands End Canvas will probably be marked down in the coming months and looks quite sturdy.  I also like the second one, but it won't hold as much.

What option do you think would be the most versatile for daily office commuting?  Where else should I be looking?  I would love something with a bit more pizazz, but I don't want patterned canvas or pvc that won't last.  And once the price goes over $200, the less likely I will be to buy.  This is hard!  

**Update:  Although I still have a post scheduled to go up tomorrow, I will be leaving town for a funeral and unable to blog for a little while.  Please excuse my lack of posts and comments on your blogs for a few days, and keep my family in your prayers.