I can't believe it's selling for $6.99 on Amazon now - that's less than the cost of manufacturing and logistics. On the other hand, the game is 3.5 years old already, so I assume they're merely clearing up old stock.
That $6.99 price is from a Marketplace seller, so it's most likely some vendor who bought up someone else's unsold stock for pennies on the dollar. Amazon.com's own price on the game is slightly over $10.
chrono trigger is fairly cheap and totally worth it, now that apparently we're not getting the PSone version the DS one will do.
We're most likely going to be getting the PS1 Chrono Trigger, just not this week. That said, I hear the DS version is the "definitive" one.
I'll recommend Super Robot Taisen: OG Saga: Endless Frontier, the DS game I'm playing these days when I get to borrow someone's DS. Ridiculously politically incorrect script, fun gameplay. Also, Dragonball Origins, one of the few (in America, at least) non-fighting Dragonball games, is actually quite good. I had to stop playing, though, because its stylus-required gameplay was making my wrist hurt.
Starfy is a game I haven't played, but as the first American release in a series which seems to have done well for Nintendo in its native land, I think it might be something worth looking into.
Since you have a DS Lite and can therefore play GBA games, I'm also going to recommend: Sigma Star Saga (beautiful cross between RPG and side-scrolling shooter, by WayForward), Gunstar Super Heroes (sequel (?) by renowned developer Treasure to its Sega Genesis run 'n gun beat 'em up classic, Gunstar Heroes), and Final Fantasy V and VI Advance.
Some things to get for the PSP instead of the DS: Disgaea, Ys I & II, Final Fantasy IV Advance. :) The DS-native version of Final Fantasy IV might be of interest, though, seeing as how it's a polygon-graphics remake.