I've been through this several times, with 8-9-10 & 11 speed Campy. Each time I moved on the new groups as soon as they came out and have no regrets.

Record 11 can be bought about as cheap as Record 10, if you know where to buy. Most US dealers have outrageous prices, but prices from a number of UK sources charge about the same for 10 or 11 speed parts.

I bought all of my 11 speed parts late last year and early this year for far less than 10 speed prices in the US, by taking advantage of favorable exchange rates.

If you know your facts about the difference between Super Record, Record and Chorus, you know that the groups above Chorus offer very little for the extra money. A new Chorus 11 group is only about $1100. Record is almost $500 more and you get very little of value for it. The shifters are identical. The Record crank only weighs 40 grams less and has ceramic hybrid crank bearings. Their are minor difference in the RD.

I'm still seeing the lowest prices at Ribble. Just don't forget that any prices displayed in US dollars have a 15% tax added to them, that gets deducted upon check out. Some other sites have this tax already deducted, so they may appear to be cheaper, but aren't.

If you want to keep using 10 speed, consider buying Centaur for a lot less. Record 10 parts are no longer in production, except as repair parts. Eventually, most dealers will only stock Centaur cassettes as 10 speed replacements.