sleeping pad - anything from exped synmat or themarest neoair xlite range that fits your weight to price ratio. they hold their resale value very well too
jet boil - skip it and get a BRS 3000 T and a titanium pot (both can be had on aliexpress)
1 man tent - secondhand six moon designs with cheap carbon pole from that guy on ebay (and an ultralight tyvek groundsheet if you buy a floorless one)
i'll be running the peaks trip again this summer, it was such a special trip!