I took a look at the absolutearts site, it's awfully busy. From a customer viewpoint, there's so much going on, it's hard to tell where to start. As an artist, I want to know how does one get featured on the home page and for how long (is extra cash involved?).
I think that unless someone is searching by your name, the chances of finding your work would be pretty slim. I just Googled "paintings,abstract" just to see what would come up. After 7 pages, I still hadn't come across a listing for absolutearts.
I'd say, spend your cash on your own site, when people find you there won't be other artists' works to distract them from your gallery.
No matter where you are on the web, it takes some work on your part to get found - send out postcards, hand out biz cards everywhere, update your site frequently so eventually search engines will find it and move you up the ranks. (I carry a little mini-portfolio in my purse - you never know when an opportunity will come up!) Judy has had a blog for some time (start a blog!), I'm sure she could offer some advice for promoting your site/blog.
Here's a site I made for another artist (it will have an online store whenever she gets some more things ready to sell):
http://maryloubarrow.com/index.html
The whole site reflects the artist's personality - which I think helps to make a connection with potential buyers. Most people want to know who the artist is. Anyone who does know her can Google her name and they'll find her site. Those gallery sites are more like a big heard of cattle all gathered together. Makes it hard to stand out and get noticed.
I guess we'll wait and see if someone has a different opinion and what gallery site they might recommend....