Big Ron, a couple of months ago I spent a week practically living on eBay before buying a newly listed Mid 2010 MacBook for the 'buy it now' of £300 (inclusive of delivery). The average selling price at that time was around £320.
I bought it on a hunch – nice photos, nicely worded listing etc

– and was rewarded with a very decent example. Had a couple of *tiny* cracks around the hinges, but I think these are pretty much unavoidable. Also came with 4GB rather than the standard 2GB of memory, but I ended up chucking these out and upgrading to 8GB and a 250GB SSD.
I'd strongly recommend one of the A1342 unibody models – the Late 2009 and Mid 2010. They're not hugely faster than the earlier MacBooks (the final Mid 2010 model is 2.4GHz C2D, and even the Late 2006 was 1.83/2.0GHz C2D) but...
a) they run OS X 10.9 nicely (and OS X 10.10 too; same is true of the last pre-unibody MacBook)
b) the unibody casing is, I believe, more durable than the previous design: I saw enough pictures of pre-unibodies to decide that they were prone to cracking at any point around the lip where the base moulding meets the keyboard/wrist-rest, and indeed cracking of the keyboard/wrist-wrest panel itself
c) in the case of the Mid 2010, you get a significantly superior graphics card compared to previous MacBooks – might be a factor if you ever fancy firing up a game (not really my cup of tea)
d) multi-touch trackpad, hell yeah!
e) the market really doesn't reflect the improvements made over the years: a three-and-a-bit year old Mid 2010 is
at most £100 more expensive than a six year old MacBook which is stuck on Lion, has (admittedly not vastly) inferior performance, and has double the miles on the clock both internally and externally
f) the prices being asked for the 13" MacBook Pro of the same era are a
complete rip-off
g) you get a
shiny new bottom for free! (although it's not uncommon for sellers to have already done this)
One possible downside of the unibody is that it doesn't have a FireWire port: you are forever stuck at USB2 transfer speeds. Wasn't an issue for me, and I appreciated the other change to the ports: a mini display port rather than mini DVI.
Bearing in mind my MacBook was rapidly upgraded to 8GB and an SSD (both upgrades I'd entrust to a ten year old child, it's that easy) I'd say I'm absolutely delighted with the performance. The heaviest thing I do on it is Photoshop (CS 5.1) editing of 20MB RAW files, and I really couldn't ask it to be any quicker.
If you just plan on doing a bit of Office and surfing then you can skip the SSD and can probably get away with 4GB of memory, but I'd still say that a unibody gives you the best physical durability and the greatest degree of future-proofing for a very small cost over and above the pre-Late 2009 models.
EDIT: have PMed you