Best etsy-clone e-commerce platform

Hi Warriors,
I'm new to the forum, so I apologize if this question has been "asked and answered" before (I did search this forum and the Website Design forum but didn't find the answer I was looking for).

I want to establish a multi-store online shopping mall targeted at a specific customer market. The most succint way for me to describe it is as an etsy-clone.

So far, I've found the following platforms that at least market themselves as being able to accomplish what I want:
* Agriya's BuySell
* SiteMile's Walleto
* WPMU's MarketPress
* iScripts Multicart

I'm looking for feedback on what people think is the better product for my project and why. Also, if you know of other alternatives that are better than the ones above please let me know.

As I'm targeting a hobbyist market, I don't want to charge people to populate a store - they will pay based on their revenue; so, I'd like to avoid sinking a large sum of money into this effort before knowing it will fly.

Some additional key things I'm looking for...

On the e-commerce side, each store owner should be able to maintain their own storefront and have some customization options (themes); although I would like to control/manage product categories centrally (i.e., from a master list). Obviously the main mall front should be able to highlight products from different stores.

The main payment option for store owners would be through revenue share (e.g., 10% of revenue goes to mall) and the platform should support an easy management of this (preferably not just through Paypal). It would be nice if the platform could also support a "monthly rent" option at the same time.

In addition to the e-commerce side, I would like to be able to offer the individual stores the ability to blog, and have an overall site forum, although I understand I can probably do this outside of the e-commerce function.

I can get by with HTML, have some experience with Joomla, and am comfortable working in WordPress. The last time I programmed anything was 30 years ago and that was in IBM 360 Assembler, so don't give me something that requires any PHP coding.

Thanks in advance for your feedback and advice.

John