Since you're doing this for SEO purposes, then i believe you're making a better case why you don't want a pre-built software. The caveot, is if this is a separate site to the one your building. It's my understanding that using the same code base when developing for SEO purposes means that your dating site will contain 90% of the code you can find on any other instance of that dating software. It's unlikely these are a robust templating system since these softwares are usually built for the features, not as a complete dating software platform.
For dating software features, SkaDate is the best one i found. Its the one everyone uses, so of course you're going to have good and bad reviews. My point is, these softwares are generally never going to be as good as something custom built. If you're willing to sacrifice code quality, then this is a good route to get the features you need with a minimal investment.
From my few conversations with their sales, which also seems to be in india, they are very responsive in the sales cycle. That is enough of a plus to give it a try here. The other dating softwares didn't really have this part together, or it's all web based.
I've been down this road with my clients many time. And for this reason I usually won't take their money if it involves building a dating site with template software. Most of these softwares are created by some team in india. they generally aren't built using latest PHP modeling standards. if it was up to me, all these applications would be built in Joomla or similar. That way I know they are using the MVC model.
Everyone wants to be the next Match, Friendster, eHarmony. There is big money here.
What I am shocked, not to discourage anyone from building, is that people take these mediocre approaches, slap down $2K to build a new business. In the real world, businesses don't get started for that kind of money. To build a real business it takes time/money and a business strategy.