I got a hold of copies of Swords & Wizardry (is that the name?) and OSRIC a few years back to see what it was. I didn't know at the time that these games are just D&D rewrites with maybe a couple of minor alterations. I have nothing against it, but I don't really see why I'd buy a game that seems to be D&D plus house rules when I know how to make my own house rules already. They kind of seem like "D&D plus this article from Dragon added on" or something. I've only seen a couple of the "clones," though: are there any that actually do anything different or special enough to consider them their own thing rather than just "D&D Knockoff Mint-n-Chip Flavor" and "D&D Knockoff Strawberry Flavor"?
I don't know if by "clones" you mean what clones usually means in the OSR. If so, the answer would be no, because the whole point of Clones is that they're near-identical copies of an old D&D ruleset.
If, however, you mean Clones in the sense of OSR Rulesets in general, there's quite a few that provide some important variety. Some of these, I guess, you could call "D&D with a few house rules". If you think LotFP is that sort of thing, and not unique enough to warrant buying, you'll probably feel the same about 70% of all the non-clone OSR rulesets.
But there are some that are a lot more different from baseline-D&D than LotFP is. Arrows of Indra is very different from standard D&D. My Lion & Dragon RPG, which is coming out sometime before the end of this year, is going to be very different from any standard D&D, much moreso than LotFP is.
What a lot of the really-different OSR rule-sets have in common is that they're made to address "OSR rules for running X genre/style/concept". Lion & Dragon, for example, will be for running a more Medieval Authentic game.