I bought (as regular readers of my posts will be bored to death with

) an SLX35 this time last year and use the top 4 sections (about 20ft) for all my domestic work including over conservatories, rooflights and even third floor (think farm houses - not massive Georgian town houses).
I add a section to take it to 25ft for third floor flats work and add two sections plus fibreglass end section for 4th floor flats.I have ordered an SLX 22 which will do all the above not typed in red plus give me an extra 2ft.
But the advice to get an SLX 25 seemes excellent to me and If it is the same as the old SLX30/35 you will be able to slide the biggest section off and use it as a 20ft to save weight and just add it when you need it.
BUT ... check the closed lengths - the SLX's come in 4ft 9" and 5ft 3" I believe. My current pole is I think 5ft 3" but the SLX22 is 4ft 9" and so a bit easier in confined spaces but has more sections.